I'd steer clear of MFC, .NET et al as they're proprietary software and wedded to Windows (both bad things IMO).

I'd have a quick look at some code written using the various libraries you're considering and pick your favourite -- to be honest they all do pretty much the same things. You can find code with http://www.google.com/codesearch.

Cheers

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Charlie Harvey's website - linux, perl, java, anarchism and punk rock: http://charlieharvey.org.uk