It was Dude who mentioned the homeschool and then grade skip option in another thread and I remembered it because we considered it. So kudos to Dude.

So many resources. Start with "A Nation Deceived" a comprehensive review of acceleration research. Freely available on the internet in two volumes from The Acceleration Institute. Don't be intimidated, it is an easy read and has lots of references. Here is the address for part one, sorry, thought it would paste the link.

http://www.accelerationinstitute.org/nation_deceived/nd_v1.pdf

Just went to the main page of the institute and you can get full report as an iBook.
http://www.accelerationinstitute.org

Next stop hoagiesgifted.org a website of some renown for resources. So many that it is easy to get distracted. Start with Gifted 101 section and browse.
And of course the Davidson Institute has an excellent database.

For how the emotional aspects of giftedness, I am currently reading the iBook of "Off The Charts: Asynchrony and the Gifted Child"

I can recommend this book of essays with easy to read info including research into the emotional aspects of giftedness. I think you would find it useful in your current position.

Also available on kindle and hard copy:

Why Gifted Kids Get Poor Grades and What You Can do About It by Sylvia Rimm
The Underachieving Gifted Child by Del Siegle

For general reading:

A Parents guide to Gifted Children

SENG is an organisation supporting the emotional development of gifted children and their website is worth a look too.