Totally agree with you regarding the limited number of accelerometer apps. The fact that the device is tethered to a power cable really detracts from it's usefulness as a stand alone physically interactive device.
I see the Chumby being used primarily in 3 different modes:
1) unattended: deco-informative display, where it sits on a shelf or table away from reach
2) semi-interactive: Chumby used like a web browser to display various pages of info. interactivity consists of paging through info on the screen or switching widget apps.
3) full interaction: games (virtual pets?), demos, robot controller?, and other oddities which require full use of the accelerometer,speaker,i/o devices.
I envision that a lot of people would like to use the chumby as a mini-extension of their monitor while working at the computer (something betweeen #1 and #2). Possibly to partition off notifications like email, IM, stock quotes, RSS Feeds, voicemail/caller ID, "reminder to go eat" from the main display. For this purpose remote access via the host keyboard would be useful.
~Rolan