Download this bittorrent client (or any, but this is my fav):
http://prdownloads.sourceforge.net/a...p.exe?download
Then d/l torrent search (
www.torrentsearch.us).
Search for "Half Life" and you should see the Half Life 2 Beta seeded by bittorrent movies. Double click on it and the torrent file should begin transfering (like 29kb or so). When it says it's finished d/l'ing the file, click open file. It should run the torrent through Azureus automatically.
After that it's just a matter of waiting.
Edit: By the way, once you've got the RAR file, it's got a password on it. The password is "www.bittorrentmovies.de".