u3 does have offer cool features such as automatic start, the eject button that close the key in few seconds, the easy possibility to protect the key with an access code...
Enjoy :)
Links:
[1] http://www.clever-stuff.ie/ativa/downloads.shtml
[2] http://portableapps.com/
[3] http://www.framakey.org/Main/Index
[4] http://www.eure.ca/
[5] http://www.prime-expert.com/flashboot/
[6] http://thinstall.com/
[7] http://www.koma-code.de/