Easily the most useful site I ever used during my Chemistry undergrad. AIST (Japan) put together a database of spectral analysis for anyone who needs to look up what a particular compound will look like under scrutiny. You can search by name, formula, weight, number of atoms, and certain NMR shifts. They just updated in May 2011 and have a somewhat ominous message about the 2011 earthquake so they are definitely up to date.
"Recovered from Japan earthquake."
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