Bitcoin is a decentralized digital currency. Instead of using a central authority, such as a bank, the transactions are shared among users via peer-to-peer connections. Since there is no central authority or Bitcoin company there is no definitive source for information or official contacts.
Bitcoin.org – The official site of the Bitcoin open source software project
Milly Bitcoin Exclusive – Bitcoin Promotional Coins and Auto Decals.
Bitcoin Business Directory - List your Bitcoin-Related Business Free