I haven't checked any of the options yet; I think sites like Wikipedia are an amazing tool. They're not the be-all-end-all supercollective virtual brain that some people (particularly lazy school children) seem to think they are. But what a great way to network vast amounts of knowlege in an easilly accessable format. Are there drawbacks? Yes.

But as for trying to learn about something, wikipedia has mostly taken over google's job as a launchpad for me.

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I'm like one of those idiot savants...well, except for the savant part.
"In order to increase awareness of the homeless, security have been given binoculars."