I did a fresh install of Boxee and the newly released Ubuntu 10.04 LTS on my Acer Aspire Revo today. The process has not changed significantly since I wrote my post How to install Ubuntu 9.10 and the Boxee Beta on an Acer Aspire Revo (including 64 bit option) back in January. You can pretty much follow these instructions to get everything up and running. One minor difference is in alsamixer where the entry formally known as “IEC958 1” now seems to be labelled “S/PDIF” (see below for screenshot) - unmute this as before. I used the recently released Boxee Beta version 0.9.21.11487 which works with Ubuntu 10.04, at the time of writing the Boxee site doesn't state this. It is also possible to integrate Boxee with the new Ubuntu One Music Store.
At long last after some delays I have finally received my new nettop and can now start properly experimenting with a device so quiet it can be used in the living room without the interruptions of noisy fans and overheating hardware. If you haven't heard of nettops then that might all be about to change. These are the desktop equivalent of netbooks.