Just to confirm that my experiences when using ORB are similar to Thoughtfix. I am able to play numerous format types of AV stored on my local PC streamed to the Nokia 770 as RM and played on the built in Video player. Off on my holidays now but will try to post more on my experiences upon my return if anyone is interested.

Its great to be able to stream rather than download when we can, as this cuts out all the time transferring items using either the USB or via Wi-Fi and then taking up large quantities of our limited storage space on the Nokia 770 even with a large 1-2Gb RS-MMC installed.