Everyone knows about the Indivision from Individual Computers...
Well they are also working on Turbo Chameleon for the c64.
http://www.syntiac.com/chameleon.htmlBasically it appears to be the ultimate upgrade for the c64 and I plan on getting one when it comes available.
I have been testing the cores they have been providing to the C-one users and they are working very well. On C-one I can switch to PAL mode as well. Nice to have a PAL c64 in NTSC land! A lot of cool stuff runs only on PAL c64 systems.