Máté Sebők has created an incredible microcontroller-based hardware emulation of the Commodore 64 SID chip called the SwinSID Ultimate (based on the original SwinSID).
It can emulate the old 6581 or newer 8580 SID chips, run in NTSC or PAL mode, and so much more. It even has blinky lights right on the board!
You can read more about the project on Facebook here, and read a review here.
To help out I created a tiny menu-driven tool that allows you to configure the various options of the SwinSID Ultimate. You can download it here from the Commodore Scene Database.