Help me with my 401K?

[afs]

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Ok, my recommendation was not simple. However, I thought there was a lot of general info that many people could use. Plus, it's more of a "teach you to fish" instead of "give you a fish." Maybe the thread could go in some kind of FAQ on how to allocate one's 401(k).

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Halfway authoritive answers to this question would be veryvery nice. I'm in a similar position to the OP (albeit w/ a far inferior plan), and really do not know what to do. At the moment I have 100% in an s&p 500 index fund ... I suspect this is not at all optimal. (I won't retire for 40 years or so; can handle a decent bit of risk.)