Let me give them some ideas:
Fix MediaShare so it properly works with DNLA compliant servers (and supports MPEG4 playback with various containers).
Add Slacker Radio. Pandora is great and all, but after a bit, I can predict what song will be next.
Add Netflix playback (yea, yea it'll compete with their VOD offerings. Whatever, get over it.)
If you have more than 1 DVR on your network, they work as one. Record a show and the collective will figure out which tuner on which DVR who has the most disk space will record the show. Regardless of which receiver you ask the show to be recorded from.
Let us add external storage +2TB. Making adding a RAID array easier (it's a real PITA now, but do-able).
Let us save the "personality" of the DVR off to a USB stick (favorite channels, record to-do lists) so that when my DVR dies, I can replace the settings (but not necessarily the shows) quickly and don't have to spend days getting it back in order.
That outta be good list to get started with.