When synching, I found the synch button to be much more consistent than pressing 1 and 2 (which I actually never got to work). Pressing 1 and 2 only works when the Wii Remote is off.
Still kinda buggy with the setup but once it's working it works good. If you have problems getting mouse mode to work, try turning the IR sensor off and on a few times and make sure you're pointing at a strong enough pair of IR sources (candles work well) AND you're far enough away from them (but not too far - 5 to 10 times the distance between them should work good). I worked a little bit on the random crashes, but couldn't come up with much. At least it shouldn't crash when it quits now.
To get started:
1. turn your Wii on with the Wii Remote (to power up the sensor bar)
2. start DarwiinRemote
3. Open the Wii Remote's battery compartment and hit the sync button, DarwiinRemote should report "Wii Remote Found".
4. Turn on the IR sensor (click the button)
5. Turn on Mouse Mode
6. Point the Wii Remote at the TV, as if your were controlling the pointer on your Wii
7. If the mouse doesn't start moving around, try turning the IR sensor off and back on (click the button twice).
General rule of thumb: if it doesn't work, quit it and re-open it.
Download DarwiinRemote 0.2a Source
Bulk of the credit for this goes to Hiroaki for the original app, and marcan and Chris for their data on the wiili wiki (rehosted).
If you can't get it to work and would like to see at least soemthing sorta nifty today, check out my High-Res QuickTime VR Panoramas.
Here's a closeup of the makeshift sensor bar used in the video below.
Demo:
