I'm frequently using Py2.4 sets, I find them quite useful, and I like them, even if they seem a little slower than dicts.
They look exactly the same speed-wise to me:
>>> t1 = Timer('randrange(100) in foo', 'from random import randrange; foo = set(xrange(1000))')
>>> t2 = Timer('randrange(100) in foo', 'from random import randrange; foo = dict.fromkeys(xrange(1000))')
>>> t1.timeit()
3.0573790073394775
>>> t2.timeit()
3.064924955368042
>>> t2.timeit()
3.0590860843658447
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