JACK is a transport layer. Pulse is a sound server. Yes, they both work with sound streams, but their similarity ends there.
The resolution of the 360 has jack shit to do with the cost of a gaming PC (duh?) and this whole discussion is a non sequitur in a thread on Gnome's marketshare speculation.
(in before laptops. I really hate the trend towards using laptops instead of desktops. if it's not being brought around, it should be kept under the desk.)