b a t t l e . a t h l e t e . s i g h t . l i n k s
Battle Athletes (Dai-Undoukai)
http://www.miao.com/daiun/

This is one of my favorite Battle Athlete pages. Why? Well, the layout isn't absolutely fabulous, and the maintainer's english is not perfect, but the episode images and depictions are unique and it gives us a better look at what the original Japanese series looks like.
Akira's Battle Athletes Page
http://www.aha.ru/~akira/battleathletes/battle_athletes.html

This is a basically Russian Battle Athletes websight. However, despite that, the image gallery is the best! The layout is simple and effective. A must see!
Battle Athletess DAIUNDOUKAI's PAGE
http://www.oocities.org/Tokyo/Bay/7879/index.html

Hmmm ... looks abandoned (or never started) ... but there are a few good images if you follow the 'enter' link.
Katsuhiko Jinnai's Battle Athletes Daiundokai Shrine
http://www.homestead.com/daiundokai/onyourmark.html

Great page! The maintainers are friendly, and the layout/asmosphere is nice to be in. The image galleries are extensive and the character bios are good. Only problem: I've got a cable modem and it still loads incredibly slow. Maybe it's too cluttered? Maybe it's Homestead.
Akemi's Anime World - Battle Athletes Page
http://www.animeworld.com/reviews/battleathletes.html
(covers battle athletes ova) This is basically a review page, however, there are some screen shots, the ending song lyrics and a good commentary.
Did I forget your Battle Athlete's websight? If so, please tell me about it!