I fully support Nintendont, but here are the features I know of:
Wireless BT controller support for non-nintendo controllers (DS3, OUYA)
Wired/Bluetooth keyboard support (Nintendont might support wired, not certain).
Wired XBOX360 controller support without an adapter
Screenshots
Image stretching to remove the black bars on the left and right of most HDTV's
Dynamic widescreen toggling in game
Forcing wireless controllers to connect to a specific controller slot
Modem emulation
Wireless debugging
Slightly more stable than Nintendont with large 16MB/128Mb memory cards (?)
Memory card image on the Wii's internal NAND (seems like a bad idea to me, but it's a feature)