This is a list of useful and popular resources that some members may not be aware of.
UK Wine Forum - a civilised discussion forum, predominantly UK based
CellarTracker - Eric's site has developed from a hobby to a thriving business, thanks to his vision and hard work. That so much of it is available on a discretionary donation basis is laudable.
Commercial Sites for wine knowledge
Jancis Robinson - The one and only HRH's site. I'm not a subscriber, but you can't not include it in a list like this!
DrinkRhone - one of the best specialist wine sites out there. JLL's knowledge of the Rhone is unrivalled
Winesearcher Pro - this is a must for anyone who wants to buy lots of wine at the most competitive prices.
Winetaxi - this is one of my own inventions. Not sure how serious it is!