Well, did you liked Trailer 1 and Trailer 2 stuff? Really like that old damn weapons and classes! To have HD gibs? Yes? Join this group! Here are some skins! To install skins go to program named My Computer, go to Local Disk C then Program Files, Steam, SteamApps, (there should be Steam Account name) common, Team Fortress 2, tf, you will find custom foldier, open it and then create New Foldier and name it my_custom_stuff.
Now, whatever you like of this skins and sounds, extract them to my_custom_stuff, open that foldier and whatever is it in that rar, extract it in my_custom_stuff.Do not extract names, extract only if have: materials,models,sounds,scripts and etc.Ok im shutting up and there are skins and sounds:
http://tf2.gamebanana.com/skins/101084
http://tf2.gamebanana.com/skins/100238
http://tf2.gamebanana.com/skins/46535
http://tf2.gamebanana.com/skins/112621
http://tf2.gamebanana.com/sounds/13764
http://tf2.gamebanana.com/sounds/14011
http://tf2.gamebanana.com/sounds/17813
http://tf2.gamebanana.com/skins/120320
http://tf2.gamebanana.com/skins/101635?vl%255Bpage%255D=2&mn=1&qpost=5848020
http://tf2.gamebanana.com/skins/124977
http://tf2.gamebanana.com/skins/42432
http://tf2.gamebanana.com/sprites/3820
http://tf2.gamebanana.com/textures/3242

That's all what i know, it's not all, if you want to see more beta skins, just search on google tf2 beta skins and find some.