iJailBreak is an automated jailbreaker for an iPod Touch.
iPhoto Mini is a widget that lets you browse your iPhoto library. You can select an album and look at the photos in that album. Additionaly, in the album popup menu you get to see how many photos each album contains.
iPod Reset Utility
Use iPod Reset Utility to restore the following iPod models back to their factory settings, when iTunes is unable to do so.
(commercial) iPodRip supports recovering your songs and playlists, playback of audio files and much more.
iPodVolumeBooster is a program which acts as a workaround for the volume limited iPods sold in Europe, which are restricted to 100 decibels of sound output.
iSquint is an iPod video conversion app for Mac OS X.
No Frills DVD2iPod
No Frills DVD2iPod converts unencrypted DVD media to iPod format.
Rip To iPod
Rips each enabled (check-marked) CD track to iTunes and immediately copies it to iPod, deletes the file, and removes the track from the iTunes library, giving the appearance of seamless CD-to-iPod importing.
Senuti is a simple application for transfering songs from your iPod back to your computer.
YamiPod is a freeware application to efficiently manage your iPod under Mac OS X, Windows and Linux. It can be run directly from your iPod and needs no installation. Take a look at the feature list to find out what it can do and feel free to suggest anything that might be missing.