Mac: The Apple TV 2 makes a great, cheap XBMC box, and now the previously mentioned Seas0npass jailbreaking tool offers untethered jailbreaking, so you can reboot without losing your hacks. A Windows version is on the way. [Firecore via How-To Geek]
More from Gizmodo
I wanna do this and then install PLEX server. Will someone with more jailbreaking experience than I confirm that this can be done, by a relative terminal noob?
(e.g., I've jailbroken an iPhone, but have no idea what a SSH blob is)