No, refund splitting is not available for tax years before 2006. You can opt to direct deposit your 2005 refund into either your checking or saving account, but you cannot split this refund among two or three accounts.
A "brokered deposit" is a deposit that is obtained from or through the assistance of a deposit broker. A "deposit broker" refers to a person engaged in the business of placing deposits or facilitating the placement of deposits with insured depository institutions. For example, a securities broker-dealer may pool money from a number of small investors, and then package and market them them to a financial institution usually in $100,000 amounts.