Copy POSIX path(s) / Copy Finder path(s) (OS X 10.4 or newer)
Copy the Unix (POSIX) or Finder-like path of one or more selected Finder items.
Two excellent candidates as Automator Finder plugins.

.DS_Store enabler/disabler (opensource) - Mac OS X 10.4 or newer
Prevent OS X from creating new .DS_Store files on network volumes.

2iTunes: convert audio tracks while importing (readable droplet) - Mac OS X
droplet to convert audio tracks while importing in iTunes, or convert again tracks using current iTunes import settings

Artist/Album Playlists (readable script) - Mac OS X
create playlists per Artist+Album

Put a script in Finder contextual menu (Mac OS X 10.4 or earlier)
how to use Automator to execute an AppleScript from Finder contextual menu

Localization switch (opensource applet, Mac OS X)
activate and deactivate the ".localized" files for Home folders

Mac OS X uninstaller script

Save Playlist tracks… (readable script) - Mac OS X
copy file tracks of current playlist

Save selected tracks… (readable script) - Mac OS X
save selected file tracks

Scan for missing files (readable script) - Mac OS X
find tracks whose file is missing

Selected tracks info (opensource script) - Mac OS X
number, size and total time for selected tracks

Set enabled… (readable script) - Mac OS 9, Mac OS X
check, uncheck or invert check for selected tracks

Split+Join (readable source) - Mac OS X
text files split & join droplet

tgzippa (opensource droplet, Mac OS X)
simple droplet to create tgz (tar-gzip) archives