A Greasemonkey script that allows adding custom tags beside usernames. It places a small link after usernames on posts/comments which can be clicked to open the tagger UI. From here you can create the tag [text and color] and it will instantly be applied to all occurrences of this username. Clicking an existing tag will open the UI again to edit or delete it. [more inside]
An independently-run MetaFilter-related project that tweets to all followers anything I've flagged as "fantastic". [more inside]
I made this bookmarklet to help me read through really long comment threads. Sometimes I don't have time to read through all of the comments, but still would like to read the "best" ones, especially those that contain supplementary information or links. [more inside]
This is a new Greasemonkey script that looks through the current Metafilter page for links. It puts copies of any that it finds (except for stuff like "posted by Somebody at 12:34") into a sidebar on the right of the page, under "Tags" (and whatever other stuff may be in that area). Also, if you hover your mouse over one of the links (in the sidebar), a popup tooltip will open showing more context (i.e. the text of the comment that the link was from, albeit a pretty poorly formatted version of that text (sorry)).