These days there are many amazing flash devices out there for great classic systems. This includes everything from devices that recreate cartridge games, floppy disk games, to even dvd drive replacements like the fpga device for the gamecube. I'd like to know what your favourite flash device is and why.
My favourite is the sd2snes. This is a device where they crammed as much into it as possible and gave it a great set of hardware for the ability to add new features in the future. The mega everdrive would be a close second because it's sort of the same concept but for the genesis.