7 is worth it.
Also -
Firefox extensions:
Adblock Plus - Blocks Ads
Downloadhelper - Download embedded shit of all sorts. I use it to gank flash games and youtube vids.
Flashblock - Blocks Flash
Gmail Notifier - Obvious
Reloadevery - Sets open tabs to reload periodically
Stumbleupon - Click for random awesome, vote for what you like or don't get better results the more you use.
Webmail Notifier - Obvious
Apps:
Audacity
Foobar2000
Nod32
Daemon Tools Lite
Most of the rest of my stuff is sorta specialty, (Graphics, movie stuff, etc) so I won't bother you with it.