Simple series now has developer pages, currently just listing all the games developed by each company, but I'll add sort of mini-profiles sooner or later. Simple GBA, PSP and DC series are probably coming at some point - PS1's Simple1500 would be a huge undertaking, though. Not to mention I'd probably have to add a US release column for those, since quite a few of them were published there by Agetec (at least, more than the two released for other formats). And other things! Because one thing this site has always been is a dumping ground for my miscellaneous internet crap.
edit: see, dreamcast's up already.