Got my ATV up and running with OSX10.5.5 without a hitch.
Okay, I first booted one install on my MacBook and that destroyed the install for the ATV. But a clean install repaired it and now it's running fine.
I installed the Astrill VPN software on it to be able to get US and UK access from the Netherlands and that runs just fine too!!
Flash sites like Hulu are just a little too slow for fun, but who knows
I have got one question: is it possible to get the iTunes version on the 10.5.5 install working with Home Sharing and my others Macs (all running 10.6 and latest itunes)? I can see the ATV on my MacBook iTunes (for some reason it's Russell's Library) but I can't access my iMac which has Hoem Sharing on (I vcan access it from my MacBook). I can however access the iMac over the network (just using the Finder). So it has to be iTunes. Tried to upgrade it to 10.2.2 but that didn't go.
Anyone any idea? Would be nice to get this ATV functionality (sort of) running again without installing media server or stuff.