There's a couple of brewpubs in Buenos Aires, one that I spent plenty of time in was Antares[/url:bt49mxmh], they had a couple of lovely beers inc and Imperial Stout and an IPA at the time, but it's not on their list anymore, perhaps a seasonal.
They've also expanded since I was there, they didn't have a place in Mendoza or Rosario to my knowledge.
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But there's also some absolutely amazing wines to be had over there for next to nothing, HUGE fan of Malbecs. And yes, the steaks are to die for.
Highly recommend Argentina as a destination. Great place.