These videos were all taken with the amazing Casio Exilim EX-F1 camera which features a variable high speed shooting mode for some serious slow-mo action at up to 1200 FPS. While the name Casio doesn’t exactly bring to mind quality output, you can’t argue with that kind of power for under $1000. Being able to get footage like this would open doors to a whole world of possibilities for aspiring film makers.
There are some more user generated video examples here and here. Casio has some official video examples at their page for the EX-F1, but some of the links are broken. This reminds me of the Canon HV20, a dedicated HD video camera which also has a high speed shooting mode but outputs much higher quality video.
Thanks Kirk for the heads up on this one.