It has been confirmed that the Ultrasn0w unlock app for the iPhone 3G does in fact work for the iPhone 3G[s] as well.  You do need to jailbreak first with Geohot’s Purplera1n solution.

Purplera1n does not activate your phone so you will need a legit AT&T sim card in order to jailbreak, but then you can unlock with Ultrasn0w, availble in Cydia, then slip in your T-Mobile sim.
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George Hotz (Geohot) has released his jailbreak solution for the iPhone 3G[s] called Purplera1n. Hotz first made fame for being the first to unlock the OG iPhone. As of right now the jailbreak is for Windows only (XP and Vista, no 7) and you must be running the latest version of iTunes.  Hotz says a Mac version is in the works.
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