Popup Blocker ...comes with sp2
Spyware Preventer ...my brain, spyware comes from accepting things from sites you shouldnt and installing p2p networks and other exe's
Antivirus ...never have let an antivirus program run in the background ever
Integrated Search Bar ...no thanx, having google as my home page is plenty fast for me
Tabbed Browsing ...why not just open a new window.. all tabbed browsing is is a waste of window space to me.
my IE ui which i cant do in firefox