I have been using the latest build for weeks now, and today while I was trying to update my media library (got a new movie) the device hung. I proceeded to try and reboot, but all I got was the skin background (blue lens-flare image) without the menus or anything. There is a mouse pointer in the top left as well, but my trackpad/keybd aren't responsive. It seems to be hung. Rebooting doesn't solve the problem. There seems to be enough space left on the device.
I'll post the xbmc.log using pastebin or something shortly http://pastebin.com/7r2U6Ge3
Edit: moving my /root/.xbmc dir makes things work again, but of course, I am starting from scratch again