Today I got my chance to test TV Row on Snow Leopard (10a380) and it works like a gem. For those who are thinking of installing the WWDC version (10a380), make a backup of your disk. Personally I recomend Carbon Copy Cloner. When you install Snow Leopard over your precious 10.5 install it may screw up your permissions and maybe more. Atleast I wasn't able to get it bootable without a kernel panic, when I installed it over an existing system. A clean install works like a charm.