I haven't used Neurontin (gabapentin) myself (for pain management or anxiety/depression) but recently came across a post on dr-bob.org mentioning a synergistic relationship between gabapentin and naproxen in pain management.

PubMed abstract
Original dr-bob.org post

Just in case anyone was interested. It looks like Neurontin has been used for just about everything.

Here's more general (US NIH) information about Gabapentin:

http://www.nlm.nih.gov/medlineplus/druginfo/uspdi/202732.html#SXX13

And some more general information from biopsychiatry.com:

http://www.biopsychiatry.com/gabapentin-neurontin.htm

Goes without saying, google is a sea of pages regarding Gabapentin.

How about some about.com just for good measure?

http://panicdisorder.about.com/od/gabapentin/