Today’s site of the week is  I have been a part of this site for a while, and have been pretty impressed with it so far.  Once you register, you can post chemistry questions for the experts to answer.  The experts are extremely knowledgable, and you get a bunch of responses in a very short time.  Great resource for the undergrad who wants a quick answer to a topic that has eluded them to this point.  An even better resource for the grad student who wants to run a research idea by a 10,000 lb brainiac.

This site gets 4.5 beakers out of 5.