Mac OS X must have's...

[MPHL]

What are the must have programs for OS X??

smc fan control
istat


those are my two that i think are pretty crucial.

 

[gibbz]

Handbrake, VLC ...

 

[riscy]

QuickSilver (it took me ages to get used to it, but now I cannot live without it)
Journier (great for making notes)
Butler
MainMenu
PTHPasteBoard
OpenOffice
AppFresh

 

[j37V]

CCC(Carbon Copy Cloner)
Handbrake
Google Notifier
Alarm Clock
iShowU
Senuti
MacTheRipper

 

[XnavxeMiyyep]

Seconding the recommendation for Butler. The ability to have multiple clipboards, right at your disposal, is amazing.

And for users with dual monitors, DejaMenu is great for bringing the top-menu to wherever your cursor is.