What I've installed on OSX.

IT upgraded my MBP to Leopard so I had to go through the process of reinstalling my apps. It's a lot simpler to do this on OSX/Unix then on Windows since apps pretty much have to install its settings and user configurations in the /Users/ directories because otherwise they will need write permissions.

However, I did have to reinstall my apps which meant looking for them again. I figure I'll just list them here so that in the future it'll save me time.

GeekTools - to display information such as my calendar and notes on the desktop
Firefox 2
Firefox 3
Versioned icons for Firefox
Thunderbird
MacPorts - the joys of UNIX!
Sidenote - unobtrusive notepad
Quicksilver
OpenProj - to be able to read/write to Microsoft Project files.
Adium - multi-protocal IM client
Colloquy - IRC client
VLC - media player
Tinker Tool - exposes hidden settings. I use it to turn off Apple's anti-aliasing and changing the system fonts
Tahoma (font)
Synergy - Allows using one keyboard to control multiple computers.
Eclipse IDE
Xcode
Flip4Mac


Commercial

Parallels/VMWare Fusion
Microsoft Office
Adobe Photoshop
OmniGraffle