I've built an extension for Mozilla Thunderbird that lets you specify system commands when new mail arrives, on a per folder basis. See the Mailbox Alert page.

Added a test page for DNSSEC. 1 URL has a verifiable secure dns entry for the given key, and the other has not (i mangled the signature of that one).

Added preferences dialog to Linktag, you can now turn off the menu options and statusbar icon, and change the form of the tag if you wish. Page.

New version of Linktag: 0.6. Now has a keyboard shortcut (Alt-L), and an untested update page (we'll see that at 0.7). Please orderly proceed to the Linktag page.

I've coded some more on my LinkTag firefox extension, it's getting to a usable status now :) I've added a status bar icon, and the tagging feature is now toggable (from Tools, contextmenu, and the statusbar icon). Don't forget to enable type-ahead find. Do it. Now.