I'd like to add a few words about using Nokia's Internet Tablets as a LinuxMCE Orbiter.
1. First of all, N800 is much much better then Nokia770. It's faster and more stable.
2. Sure, N810 works fine as the Orbiter.
3. There is a one click installation scripts for bora, chinook and diablo - http://diapub.com/~michael/
(thanks to Oliver for idea and Andrew for the server space)
4. It's possible to install OS2008HE on the Nokia770. It's more or less ok. But performance is worser then with OS2007HE.
5. Nokia 770 works fine as Orbiter under OS2007HE with a simple tuning - http://tinyurl.com/6d6pua
6. Bad news - Nokia officially stop to produce Nokia770 and N800.