
Originally Posted by
Etiko
With games like Left4Dead and TF2 you can either join a dedicated server and then invite your friends to join that server (PSN style) with you or you can just host your own server and then also invite friends (Xbox Live Style).
Steam is awesome and is one of the huge reasons PC gaming has not died, yet (imho of course).
Interesting thing is that Activision Blizzard games are not on Steam. Don't be surprised if Battle.net 2.0 is going to be their version of Steam... but that is a topic all on its own!