Actually, the WS version of beatmania is arcade perfect, audibly. Of course, it's black and white, has a worse button layout, and is a conversion of beatmania 3rd MIX which came out what...late 1997, early 1998?, so that doesn't say much. Still, it is a lot better than the GBC ones! Sort of.
Capcom made quite a few games for it too, such as Pocket Fighter and a Megaman game (which isn't very good), and a remake of MakaiMura (Ghosts 'n' Goblins), all 3 of which are B&W. Taito made a sequel to Rainbow Islands called Putty's Party, which is essentially Rainbow Islands hacked to hell. I think you start on Doh Island or something stupid. It's also B&W. The Final Fantasy games on it are pretty hard to get these days, due to squaresoft fanboys going nuts. They are around though, and I think maybe even play-asia has them. FF1 and FF2 are translated, as was said. FF4 is on WSC also but it isn't translated - shame, because it's visually a lot better than the SNES version (!). Other than these games and what was already mentioned, there's little else recognisable.
Oh, and if I recall correctly, it is still being produced - but the only way you can get them now is direct through Bandai itself. They certainly aren't low on stock in HK at any rate. They are pretty much exclusively a collectors item now. If you're really in the market for another oddball portable console, my recommendation would be a NGPC if you're not in particular a squaresoft fanboy, and by that I mean you don't mind playing games in Japanese (unless you buy a flasher+cart, in which case you can flash the english translations). After that, maybe a Nomad or a Game Axe.
Oh, and I'm not sure about websites on them. If you're after reviews of the FF games, try a RPG site of some sort. Or just play the PSX FF Origins - it's essentially identical.
No, I don't own one B)