I haven't gotten to the point where David is, but i'm trying (leopard
isn't "approved for use" in our organization yet, they expect it to be
in a few months, but i can still use it at home :).

something to add to the knowledge base (although pretty obvious, it
stunned me this morning): if you are upgrading a Tiger machine that
had xcode installed on it you must upgrade the xcode tools too, or you
won't be able to link any binary from p9p.

xcode is available on developer.apple.com or on the upgrade dvd that
has leopard.