Being active in the forums is by far the best thing to do when starting your journey to 6800 jedi master status.
I suggest:
upgrading rom to 3.35
installing the flash video bundle
installing a gps app
setting up preferences in the phone. (clear type, screen brightness, camera settings, caller id, etc.)
setting up bookmarks in PIE
installing htc home today screen plugin
find a cool theme ( i suggest allblack.tsk)
test evdo speed at dslreports
setup adhoc network with wmwifirouter
turn off incoming beams
setup email pop or hotmail
participate in the forums!
Welcome aboard!