Are guys going to answer his question?
OK, MAC APP STORE!!! Great source, a little lacking right now, but it will expand greatly with great apps. I have some recommendations.
Mac App Store:
Gif Quick Maker: Always fun to make a neat little GIF
Video Tennis: AWESOME! It's like Kinect for XBox! For Pong.
Minesweeper: The only thing I missed from Windows.
OSMOS: I cannot even explain this game, the sheer awesomeness, the serenity
NON-App Store:
The GIMP: Like photoshop, but free!
iWork: iW=Office x 100 - $$$$$ (You can always pirate)
Vuze/Transmission: Two great bitTorrent clients, I would recommend Limewire, but, that was shutdown.
VMWare Fusion: Virtualization, run any OS, (and I mean any, like obscure open-source ones), I recommend pirating, otherwise, get
VirtualBox, not as good, but free!
DropBox:









If you're a developer: get
XCode,
NetBeans, and
KOD (text editor)
Skype: GET SKYPE! IT'S FREE AND AWESOME!
FaceTime for Mac: Good if you have Ipod Touch and Iphone 4 facetime friends
AirPlayer: It tricks your iPT or iPhone into airplaying to your computer instead of just aTV's (NOTE: still in Alpha, but it works)
Sophos Anti-Virus: (For the paranoid) Free. WHY NOT!
Wine/Wine Bottler: Wine lets you run Windows programs without emulation. WineBottler turns Windows programs INTO Mac OS X apps. AWESOME!
ThunderBird: If Mac's MAIL app doesn't cut it, Mozilla ThunderBird is a good Mail Client. Speaking of Mozilla,
FireFox is a good replacement for Safari, as is
Google Chrome.
Hope this helped.