Permalinks are the little stay-in-place URLs that make bookmarks viable. The keeper of a page signals his or her best promises that if you bookmark this link, that bookmark will keep pointing to this page, or in the case of a comment permalink, to that particular spot on this particular page, whatever other changes he or she makes to her page templates et cetera. Offering (and not only saying, but doing so) permalinks to content and microcontent provides longevity to your blog and adds value to it and its visitors alike. It's a seal of quality, and of showing that you care about your work and those who read and link to it enough not to suddenly dump it in the big bit bucket in the sky, breaking links all over the web and making future would-be visitors angry with you for having robbed them of whatever next part in a chain of on line hypertext they were tracking.
Hypertext is a volatile medium only in so far as content providers don't care about making it a lasting, permanent structure worthy of attaching to and building even more off of. Permalinks offer the joints of these structures we call the web.
Blogger templates, by default, offer permalinks to posts, unless you change titles or month on them, and to comments to those posts. Blogger even standardizes the format of link names and names of anchors (mid-page permalink targets), naming post comment sections "#comments", backlinks "#links" and individual comments "#c<huge comment timestamp number>". I say timestamp number, because it is the number of nanoseconds passed since the dawn of the Epoch (January 1, 1970), divided by ten. (So if you ever scoffed at not being able to tell down to the second just when a comment was posted, well, you didn't know better. :-)
I'm going out on a tangent here, but before I return to the topic, let's make a nifty little tool that helps you date a comment, to the (tenth) nanosecond, by pasting it's permalink here (it works for post id numbers too):
Let's go back to comments and standardized permalinks again. Standardization has some benefits to your reader base, making it worth adhering to them, at least if your blog is on Blogger. (And, similarly, if there is a de facto standard for what anchors to have in a page for which content sections on your different blog or publishing system, there are the very same reasons to adhere to that system rather than Blogger's.)
Any sufficiently large, useful and loved system on the web will grow a following of useful tools to do good things for and with them, whether they are more or less made for the purpose, such as Del.icio.us, or not, as in the case of Blogger. But tools will develop, and they will target the broad main line doing what most blogs do, staying close or identical to the default setup. Again, this is not something to be ashamed of, but a useful choice. I'm going to devote most of the rest of this post to one example of a tool that thrives on Blogger's standard comment links.
Some people across the web have felt there is an embarrassing lack of infrastructure on offer for looking up what you said last week to whom about what, and most of all, where. You post a comment on some blog, forum or whatnot, and then you forget most of it, except perhaps that it was about somebody's clever money making scheme, quest for fame, or perhaps a game you like. It must have been back in September. Or maybe August. But Google just won't find it for you, as you can't seem to pick out your particular wording, or something unique in the context surrounding it, and your thoughts are forever lost.
See? That's a lack of infrastructure. Of course there should be something that keeps track of what you write when you write it, perhaps offering some means of tagging it for a later reminder. You could of course bookmark every single comment you wrote and keep an index over them in a database... ...but it quickly leaps into deep geek realms where only those in need of spending huge amounts of time to solving taxing computer science problems roam. And not many of those either; most spend their time on more productive things. (Or playing World of Warcraft.)
But add a tool to do the bookmarking for you, extract your comments when they are written and that just makes it a click or two to decide whether you want to keep this in your web feedback history or forever leave it adrift in web space, organize them into a huge database maintained by other benevolent people, and suddenly it becomes viable. And it is already done, too. It's called Comment Blogging and there is a Greasemonkey user script to pick up all your Blogger comments already. Provided the Blogger blogs you visit use the common Blogger anchor layout; otherwise your comments will hang in the air, missing their target on the page unless you learn the blog's URL layout and compensate manually for every comment you write there. Not very likely, no; it's already too much work for too little gain.
This was one first tool, using Del.icio.us to store the comment bodies, locations and tags mostly automatedly. Del.icio.us isn't particularly addressing this usage domain, though it provides some decent tools to do the work anyway, by being a rather generic and accessable thing in general. Singpolyma has just released another one, specifically targeting Comment Blogging and comment bloggers, with features such as marking not only where a comment was dropped, but what it was a comment to, which should eventually allow for some rather advanced comment tree threading facilities, assuming we would ever want to publish and navigate through the conversation jungles spreading across the web, unsatisfied with just being able to find things.
I know I want to.
It's perhaps not all unsurprisingly (Stephen reads this blog, and we have much common interest in this field and topic) rather similar to some blue sky ponderings about cross blog commentary a few weeks ago -- it lives on the Ning playground, and you only need to register a user name to get going yourself. Name to be decided, I presume, but you may soon hook up and import your Del.icio.us CommentBlogging comments, publish a feed and knit it into your post templates. (The importer still needs some love, at the time of writing.)
It will be lots of fun adapting Greasemonkey scripts to put Singpolyma's work to comfy use in day to day blogging. You won't have to pull all that weight yourself, unless you really want to, Stephen. :-) And feel free to toss some of the ideas I'm assuming you must have into the idea blog, now that your baby is known to the world; I'll be sure to tag along. Literally. :-)