Great news following Borderlands 2.
When Borderlands 2 is released September 18 in North America and September 21 internationally. All PC versions will be steam compatible. Which means all the steam features including: Online Matchmaking, Steam Cloud Support, Steam Achievements, as well as Auto Updating and more. You do not have to buy Borderlands 2 on Steam to get these features you can buy it retail and add to your Steam library to enjoy.
Also don’t forget to pre-order Borderlands 2 to get awesome in game content!