In general the new HTPC is working well, but I was having problems with Launchcast audio streams stopping suddenly with the error “While Stopping, Network Timeout.“ Since I didn't find much information on this problem I thought I'd mention my apparent solution, which was to disable the ActiveArmor firewall that came with the NVidia nForce chipset software.
Because the problem was intermittant I'm not 100% sure that this was is the fix, but I'm going on 6 hours now with no TCP problems whatsoever.
Good luck!