Stella is a multi-platform Atari 2600 VCS emulator released under the GNU General Public License (GPL). Stella was originally developed for Linux by Bradford W. Mott, however, since its original release several people have joined the development team to port Stella to other operating systems.

Changes:

4-player paddle support
Ability to set the paddle mode to use (Roll, IR, or Analog joystick)
Wiimote “Roll” paddle mode (similar to Bit Trip Beat)
Ability to set “Roll” paddle mode sensitivity and center
Wiimote “IR” paddle mode (rewritten since 0.1)
Ability to set “IR” paddle mode sensitivity
Analog joystick horiz/vert paddle mode (Classic, Nunchuk, Gamecube)
Ability to set analog paddle mode sensitivity
Analog joystick control support (in game and during menu navigation)
Driving control support (via d-pads and analog controls)
Ability to toggle color/BW modes from controller (Starmaster, etc.)
Improved sound support
Fixed bug that caused some games to always display at 1x (versus 2x)
Fixed emulation of select/reset buttons (you can now hold them down)
Added ability to display rom info (screenshots) when browsing (slow, see known issues)

http://www.wiibrew.org/wiki/Wii2600