An updated wireless version of the adapted Wii-mote using an Arduino board and Xbee wireless circuits can be found here.
Step 1: Soldering Tips Before You Begin
To solder very small items follow the following procedure:
1. Spread some soldering flux on the components you wish to solder.
2. Gather a bit of solder on the tip of your iron.
3. Touch the components together.
4. Give the components a kiss with the soldering iron. The solder on the tip should transfer to the components.
Take care not to put to much solder on the tip of the iron, doing so may result in the bridging of two or more components you don't want soldered together