From the obvious to the obscure, these links should and will help any and all FRP members navigating the wonderful world of the Forgotten Realms.
Wizards of the Coast(The home source of DnD)
Candlekeep(A most retched hive of Scum and......I mean, THE place for Faerunian lore.)
Forgotten Realms: The Library(Novel lists, that one might read up on everything Forgotten Realms)
D20SRD(The System Reference Document, helping with all core rules in DnD 3.X)
Forgotten Realms Help(Seems obvious enough. Great weather tables)
Erik Scott de Bie(Who really likes this guy? Seriously? Still, he did visit once or twice, so lets give him a link

)
Paul S. Kemp(I think we all know why he gets his own link)
History of the Forgotten Realms(If you want to brush up on point by point history, with an easy search feature, this is it.)