Trackballs are neat. They work well when you want a more "personalized" experience with your mousing, like when you are playing arcade games or messing around with map software.
I was walking through South Hills Village Mall when I found a toy shop, Smart Toys. Browsing around the store, I saw an interesting gadget — a trackball TV golf game. Typically, these things are a little joystick with a couple of buttons and some RCA jacks for the television. But this one was a complete trackball. It was made well too! Better yet, it was on sale! So I bought it and quickly went home to tear it apart.
Inside, I found that the X and Y axis were measured in the same way as a standard ball mouse, so I began to think of ways I could hack the two together. In the end, I did just that, and here is how I ended up with my $40 lap-compatible trackball that also plays Golden Tee: