Here's a little nugget for WordPress users. If you subscribe to a TrackBack aggregator like AustinBloggers, they want you to TrackBack all the posts you make that are relevant to that site, so that they can collect them for their audience. You can set up a category for that topic (for example: "Austin"). Unfortunately, WordPress doesn't allow you to set per-category TrackBack settings...until now! :)
I whipped up some code over the weekend that acts as a plugin to WordPress 1.5 called Auto-TrackBack by Category. Installation is fairly easy, upload the file to your plugins directory, "activate" it in the control panel, and setup your auto-TrackBack URI's for each category. The plugin will autofill the TrackBack URI's you setup when you save or publish a post to any category you define URI's against.
The only thing I really don't like about this plugin is that there is no easy way within the WordPress plugin structure to pre-fill the trackback URI; it has to happen after you hit save on the post. So if you have a specific post in a category that you setup for auto-TrackBack that you do not want to auto-TrackBack, you need to save the post, edit out the auto-URI, and then publish. Hopefully that will be the exception for most people.
This is 1.0 code so treat gingerly! Otherwise, grab it and go - and let me know if it works for you!
Thanks also to Keith McDuffee @ http://www.gudlyf.com/ whose Category Visibility plugin provided much of the framework for this plugin.