The Bitcoin-OTC project is a marketplace for people to conduct over-the-counter trading in bitcoin.
It is located in various IRC channels on the freenode IRC network:
Trading in the market is facilitated by the gribble bot, which takes care of maintaining the outstanding order book, as well as a web of trust user rating system. All trades are conducted between users directly, without any intermediation by the marketplace.
site link: http://www.bitcoin-otc.com/
Choose carefully any service that store and manage funds for you. Very few Bitcoin businesses offer enough insurances to be used to store money securely like a bank at this point.