HL2 Orange box is due out on october 10, if you preorder now you get access to the TF2 beta next monday!
Announcement:
http://storefront.steampowered.com/S.../message/1189/
Some TF2 gameplay vids:
http://www.totaltf2.com/general-news...ed-movies.html
Team Fortress Classic basically owned my life for 2 years straight before counter strike came out, I am sure TF2 will do the same.