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Well, VisualHub was one of those... wait for Handbrake's new release.

Get:

Appcleaner (uninstaller)

MainMenu (systen clean)

Handbrake (ripping dvd)

Transmission (torrent)
 
VMware - so you can run Linux.
Firefox - less buggy then Safari and snappier too.
Thunderbird - less features then mail, but seems to be stabler.
Songbird - From Mozilla, It's like iTunes, Firefox and last.fm all in one ( it is in beta and still needs a lot of work, but I think it has a ton more potential then iTunes.

VMWare is the only commercial application. Firefox, Thunderbird, and Songbird are all open source, and a lot off people have developed some great plug ins for all 3.
 
Update to the post concerning Handbrake. You could download the beta version. It works fine, but I will definitely upgrade to the official version when it's out.

Every mac should have firefox, VLC (plays anything...), and Google earth.
 
you can still use VisualHub you just need to find a download link for it and politely ask the developers if you can buy a license knowing it is now not supported. if that doesnt work try ffmpegX.

Perian - adds codecs to QuickTime Player (not iTunes)
VLC - for the obscure video that you cannot play in QuickTime
Toast - media burning app
MacTheRipper - to rip exact copies of DVDs which can then convert with VisualHub/ffmpegX or burnt with Toast.
Handbrake - rip and convert DVDs

also check out the sticky at the top of this forum.
 
Perian - Additional codec support
VirtualBox - Like VMWare only free
App Update - Checks all your installed apps for newer versions
GimmeSomeTune - Pop up for iTunes to display your album art works when not registered at the iTunes store as well.
iStat Menus - Displays system information like net & cpu usage, temperatures, memory...
MacTheRipper - Rips DVDs plus the already mentioned Handbrake to encode and VLC the Swiss army knife of players.
Renamer4Mac - Batch renaming of files.
 
Flip4Mac so you can view .wmv files. Installing Windows Media Player 9 is a hassle since you have to download Stuffit Expander to unpackage the WMP9 installer...
 
adium
flip4mac
transmission
firefox

edit: whoops sorry, only read the title. not sure about vid ripping
 
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