hmmm lets see

firefox with more often than not 30+ tabs open, sometimes close to 100 even

i know, im ADD big time

IE as well, with a couple video feeds running

tweet deck
windows mail
icq
msn live messenger
utrorrent
mirc with 2-3 chatrooms going
skype
photoshop
dreamweaver
winscp
VLC Player
windows media player

right now im using 3.17GB of 4GB ram