you'll have a great time.
download tinkertool (adjusts certain hidden os x settings)
download iStat Pro (monitors system performance + battery in dashboard)
download caffeine (keeps the display from dimming)
set up spaces (i.e mail+ical in space 1, safari+ichat in space 2, itunes+iphoto in space 3). it's really great.
hold shift and invoke expose (4 fingers sliding down)
hold shift and invoke dashboard (F4)
press control, option, command 8 🙂
so many great and fun things you can do!!