now you can find out what exactly it's sending out..

http://www.wireshark.org/

unless it's all encrypted ofcourse.. think you are under siege by some bloatware? now you can find out ;-)

It's Ethereal with a new name :)
http://www.wireshark.org/news/20060607.html

Check out http://www.remote-exploit.org/backtrack_devlog.html
Awsome Linux Wifi Tools (includes wireshark). I've been booting of a USB stick for a while and it works great!