Just thought I would let everyone know that Crucial ram is available now for the Mac Pro, although it is obviously way overpriced for only 1 GB sticks.
http://crucial.com/store/listparts.aspx?model=Mac%20Pro%20%288-core%20Xeon%205400%20Series%29
http://crucial.com/store/listparts.aspx?model=Mac%20Pro%20%288-core%20Xeon%205400%20Series%29