Battle.net
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From Diablo Wiki
Battle.net is Blizzard's online match-making component for several of their game franchises.
Description
Battle.net is supported for Diablo, StarCraft, Diablo II, WarCraft II: Battle.net Edition and WarCraft III, including expansions. It is announced to also support StarCraft II and Diablo III when those games are released. The network will get a complete overhaul with the release of StarCraft II, and games media are anticipating a great range of features.
Read more about Battle.net and Battle.net 2.0 here.