Clean site design. The Mpegs are worth the download time. If you've never seen competition forms check out the early clips. Things like wheel to aerial to side flip landing forward, cartwheel to one-legged side flip, au esquisito into fola secca, and slanted aerials. This site has a Discussion Group frequented by major tournament competitors.
Discussions sometimes degenerate to flame sessions.
If you want to buy a video, then shop carefully. Black and Blue produces tons of videos, but only a small subset covers acrobatic sport karate and not all of those are actually worthwhile. Pretty in depth articles for a website like this. The back flip and aerial off walls look cool, but I wouldn't try them unless you have a qualified instructor and spotter. A little cluttered, but some worthwhile links and info.