I love Casio slow-motion cameras, even if their stills are generally not all that great. The new EX-FH100 is pocket-sized, has a 10x zoom and a new 120fps mode that doesn't have low-light issues. Love it.
Older cameras would be impossible to use at 300fps indoors, because the grain and exposure would become an issue. A quick test on the floor of CES showed that even zoomed in, the 120FPS mode, benefiting from the highly light sensitive backlit CMOS, did really well. And truthfully, 120FPS is better for sports, etc than 300FPS, in my opinion. The 120FPS mode also has another benefit - 640 x 480 pixel res, which is more usable than the old 300fps mode's 512 x 384 res. It has modes up to 1000fps, though.
I'm getting one of these, without a doubt.