Information on Bitcoin is found many places on the Web. Below are some resources:
BitcoinTalk.org - the most prominent forum for Bitcoin. You'll probably find the most expert knowledge on Bitcoin here from people often happy to help.
Bitcoin wiki - this is probably the most organized source of information for the widest wide range of topics for Bitcoin. Note, however, that as common with wikis anyone can change the content there.
WeUseCoins.com - a great resource providing an overview of Bitcoin.
bitcoin.stackexchange.com - a great place to ask questions and see questions/answers on a wide variety of things.