Coin Escrow is an escrow service for transactions that involve cryptocurrencies like bitcoins, litecoins, namecoins, devcoins, ppcoins, and terracoins.

Charging a .25% fee for every transaction, along with the standard wallet fees.

site link: http://coinescrow.org/

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.