No sound yet - I'm exploring it a little but I'm trying to get things stable first.
And yes, it's my N810 - should work on N800 as well (same kernel). N770 is probably a no-go - Android "requires" 128MB and the lowest anyone's gotten 1.6 or 2.0 to run usably in is isn't much less.
For what it's worth, 2.0 easily maxes out the 128MB in the N810 running the browser, and as you approach the RAM ceiling things get slower as the garbage collector has to run all the time.