Fuse filesystems

• PownceFS — Fuse filesystem that makes all of your Pownce friends’ files accessible in the local filesystem.

C (plus plus)

• curvr — Automatic approximation of typical Photoshop actions.  Also has the associated bits for relaying uploads to Flickr.

PHP for you

• Bashpress — Command-line blogging tool sans comments.  (Actually, there’s a tag that has a rudimentary commenting system but I decided I won’t want it.)
• Treeplates — Simple, directory-tree based PHP templating.  Great for fairly static websites.

Greasemonkey scripts

• readelicious — Adds links to post to del.icio.us within Google Reader.
• immersion — Adds links to show the source page in an <iframe> within Google Reader.

Wordpress plugins

• wp-screenshots — Shows a list of small screenshots from a given del.icio.us feed.

Rails plugins

• Yahoo! Mail API — Admittedly incomplete, but a starter for using Yahoo! Mail data in a Rails app.  Bonus: also includes my sweet BBAuth plugin.