So, the Galaxy S II 'Voice Talk' is basically a re-branded Vlingo implementation:

http://www.vlingo.com/demo/videos

I wonder if this sends voice to a server ala Google speech-to-text, or if it happens on the phone. It seems to happen on the phone, which is cool.

I really like that Samsung is choosing competent existing software rather than trying to build it all in-house. The S II should have a superb out of the box experience.

I've heard that Vlingo can be hit or miss, though.