If you're hungry for a new core to play with, here's a port of the BBC Micro / Master core from MiST!
http://retroramblings.net/?page_id=1841
As usual, you'll need the ROM file from the MiST version of the core - linked from the project page.
The MiST core's download page also links to a nice VHD file with a bunch of software pre-installed.
The C64 keyboard is supported, with the all-important break key mapped to run/stop + delete.
Have fun!