Hi FT,
First post here.
I am currently living in Buenos Aires, Argentina and came down here with 3 guide books; frommers, fodors, and LP.
In general I was pretty disappointed with them and a lot of the information was outdated. Once I arrived i found a great expat community who suggested an online guide, babible.com - it is free for students and they have an iphone mobile version which is handy. The guide is interesting and worth it since it is free.
The internet has a ton of information, but online guides that can be updated regularly by someone from the specific country is invaluable. Sometimes too much information on the 'nets makes it hard to decide what to do/see/eat.
Quality control in Argentina is a huge issue, thus some "hot" spots quickly become places to skip. Having the flexibility of constantly receiving updates is nice.
Time Out in BA is also a good go to source.
TWG_1