http://battleship.ibbun.com/main.htm
I can't read any of it. Some of it's in Chinese and some's in Korean I think - anyway, the hodgepodge hieroglyphics aren't the amazing part. Click on the second blue link on the left sidebar, fifth one from the top. It's a gallery of very high-quality cover scans from, as best as I can estimate, nearly half of the entire PCE CD library. Most even include scans of the back cover. There's also a smaller gallery for PC-FX covers - it might be all of them, I'm not sure, very few games were released for that.
Anyway, I was thrilled 'cause I've been looking for something like this for a while. Are there any similar game cover and/or manual galleries anywhere in the vast infinity of cyberspace? I know Atari Age has an excellent cover/manual gallery for the Atari systems and SMS Power has alot from the old Sega consoles, but that's all I know of.

In retrospect, I'm pretty sure the PCE was the greatest game console ever made.