Steam is a game and download/update manager from Valve, the creator of Half-Life.
Features
Allowing you to buy and download any of Valve's games, like the recent, fantastic Left 4 Dead 2, Steam also has a huge library of titles from other big developers, as well as free demos and videos. The list of games is ever increasing, and it also supports non-commercial things like game mods.
Usability
Installing and setting up a Steam account is really easy, and the download manager is very stable. Whatever your internet connection speed, you don't need to worry about stopping a download partway through. If you exit Steam, it will continue your downloads the next time you start it without complaints.
While you miss out on a box or instruction booklet by buying games from Steam, you do get all the latest patches and updates downloaded automatically. There are often exclusive demos and offers available through Steam too, and there's a great community service which allows you to join groups and find people to play online. Its major downfall is that the client auto-updates far too often.
Improvements
This new version of Steam has a much improved interface, with a better news stream and cleaner overall feel. The layout is much simpler, allowing you to quickly navigate between games, available demos and videos. There's a game wishlist feature, and your game library now has real time search and customizable categories.
Conclusion
Steam may not sell every game under the sun, but it's an excellent download application featuring some of the best PC gaming you can find, and the best community features found in PC gaming.
