I've been reading up on a lot of these of late and thought I'd share with the community some good references pages:

http://gssiweb.com/ ( a good quality site for sports nutrition issues, with a learn towards sports drinks)

http://glenncardwell.com/ < all you ever wanted to know about chocolate and training

http://www.ausport.gov.au/ais/nutrition

I'll dig up a few more when I remember them