[MAC Help] Calling all Mac geeks

ok guys...

most of yall know Im a techie, but one thing I have always been missing on my network is a Macintosh.
This past week I fixed that by purchasing a Powermac G4 Gigabit Ethernet machine(dual 450s/512RAM/20G) and have spent some time in the last few days learning about my new toy.

I thought at this point I would request some help with what you consider must-have apps(freeware/shareware/etc)

IT has OSX 10.1 on it..but that will change this weekend when I get Tiger to install on it.

soo....hit me up Macies....what are the best Mac apps and sites that I must get/visit?