I was surprised to find a page on Cave (I think it's new, I'd looked earlier). I expanded the page with more information on the company, a list of games. I was surprised to see that there exists a DoDonPachi page, which apparently is need of cleaning up.
http://en.wikipedia.org/wiki/Cave_%28video_games%29
There's very little information on Wikipedia. A few articles on some of the big names series (Gradius, R-Type), and a handful of companies. If you have the information, write up some information on Psikyo or TechnoSoft or Armed Police Batrider. Or expand the pages on Battle Garegga or DoDonPachi. There could be a lot more information available; our combined knowledge could result in some very informative entries.