Bodybuilding.com is an excellent depository of workout regimens, supplements, some diet tips, etc. but I'm really not a fan of the forums. Just like the local gym, there's a lot of misinformation and outright BS, especially regarding supplements.
When it comes to supplements, with most products to most people, they range from marginal returns at best to a complete waste of money at worst. To people out there who take fitness extremely seriously (as in people who are more serious than probably anybody in this thread), some may have some real value. But to most of us, who spend maybe 8-10 hours a week in the gym a week while having a few beers or cheater meals during the week, most supplements are of almost no value, except for some sort of placebo effect.