Jordan Sanborn has posted his application that allows you to play the guitar with the Wii-Mote.
To control the frets, start by holding wiimote 1 flat for the first fret,Get the GlovePIE Script and application here.
then for each consecutive fret, tilt it slightly more towards vertical.
There are 5 possible frets.
The 4th is vertical, and the fifth is tilted slightly forward from vertical.
For no fret, hold the "B" button.
To pick, hold down a button on wiimote 2, and flick your wrist.
The string keys is as follows:
B - low E string.
A - A string.
Down - D string.
Left - G string.
Right - B string.
Up - high E string.
Watch the video of Wiitar! 2.0 in Action: