These threads always seem to pop every once in awhile but I'm a fan of them so I'll play along
AirStumbler: wireless network discover tool. I prefer it to MacStumbler.
Backlight: allows screensavers to be used as desktops, works great with MarineAquarium
WClock: menu bar clock with pop down calendar, now that Calendarclock/MenuCalendarClock has become shareware.
iCal Birthday Shifter: takes birthdays from Address Book and makes them into events in iCal.
iGetMovies: copies Quicktime movies from the iTMS and Safari to your desktop.
iPhoto Buddy: allows you to make multiple iPhoto libraries. Indispensible app which makes iPhoto that much better.
JAlbum: generates photo galleries for your website. Who needs .mac?
Quicksilver : application launcherx10. Closest thing to Spotlight at the moment. Greatest freeware app full stop.
TinkerTool: gives you access to additional preferences settings.
VLC: for all your multimedia needs.
Onyx: maintenance app.
MacUpdate: last but not least, the place to get all your freewares/sharewares!
That should be do for now!
I'm a big fan of the Mac developer scene, and am constantly amazed at the quality of the freeware/shareware apps available. Download and support them people!