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Another online buffet of fun,
Team Fortress 2 is an example of how Steam allows Valve to constantly evolve a game, increasing its life span far beyond what would originally be possible. When it was released in 2007 it was quickly praised for its intuitive team-placed gameplay, but in the two years since it has gained so many features that it has been essentially reinvented.
The most notable of these are the class updates. Over time, various classes have been given additional abilities and weapons which further compliment their original roles. These additions have deepened the game considerably. Other additions include new maps, game types, and achievements.
Technically, these evolutionary advancements could be patched into any game. However, patch systems tend to eventually become confused - people become unsure which patch is the latest and how to update to the current version. Steam takes care of all the dirty work, making sure that the future of Team Fortress 2 unfolds smoothly.