Wikipedia is pretty useful, I definitely use Wiki when I'm looking up something on a specific topic for some quick info
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I use both, although normally I'll try Wikipedia first, and if I don't find what I'm looking for, I'll check Google. It's just personal prefernece – I'm not sure whether Google should take over Wikipedia though. Would that really benefit the end user in any way?
JodoHost(Stephen), if you find an entry which has incorrect information, you can always edit it yourself. Normally I've found all the information to be correct, although if I find something which is incorrect, or an area which is lacking (and I'm knowledgeable on that subject), then I'll just edit or add to the entry.