This is just a design I came up with while working on another project, which I'll post about if successful. Ultimately, this robot was a failure because it's not powerful and can't steer (the treads are too close together), but it looked interesting. Also, since the treads go all around the robot, it can still drive when it's upside down or on either end, so that was pretty neat too.
Anyway, how useful/practical have you found these treads? I like their size and the fact that you can make them as long as you want, but then I don't like their slipperiness (although people have fixed that with stuff like liquid rubber), and they don't seem to "fit" very well on robots (lots of times they're either too long or too short).