For those who don't know what NaNoWriMo is, here's the website. They have a very helpful Reference Desk where you can research pretty much anything. The danger is spending more time there than actually writing.
If getting words on the page is a problem, Write or Die has a nifty online app that punishes you if you stop writing for too long before you reach your wordcount or the timer runs out. The consequences vary from a gentle reminder to your word unwriting itself. If you're more for the carrot than the stick, Written? Kitten! offers pictures of fluffy cats for wordcount. Just don't set your count too low as the number of available kittens isn't that big.
Of course, you'll be wanting to keep track of your wordcount, and post status updates all over your social networking. Writertopia have a couple of nifty wordcounters you can add to blog posts.
Finally, if you're struggling for ideas, Seventh Sanctum has a random story generator, along with generators for settings, characters, and other random things. Just don't spend all your time playing with it.