On gnutella, you are either in one of 2 modes ( minus a normal peer); Ultrapeer or leaf.
Ultrapeers are usually servants/user with good uptimes and a broadband+ connection. They have leafs connected to them, sheilding them from much of the gnutella traffic and handling it more effeciently.
there will be a another build out tuesday with more issues addressed and i will try to get more info for all.