If you're looking to learn skills transferable to a real piano, weighted keys are probably a big issue, for the sole reason (and I'm not a pianist) that some "keyboards" (which are actually key-based MIDI input devices) have super "springy" keys, which really feel nothing remotely like a real piano.
I'd imagine that the difference in feel would be significant enough for it to be almost like learning a different instrument. I have a small Edirol one, which I use for MIDI input and I'm making a distinction here between that and actual 'piano playing'. The keys are unweighted and sprung in such a manner that they 'pop' up quite forcefully, completely unlike the real deal. However, it suits my needs (which do not include learning piano).
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