The Euro MD list is complete (AFAIK), title-wise, but there's still a few details like release years, part numbers etc to fill in for some titles. It's getting there
I've got a pretty complete Jap gamelist (ripped from a Japanese site), but haven't really the time/knowledge to do much work with it. I know Ed Obscuro was putting something together on his website, but I can't find the link at the moment (it's not the site in his profile).
If anyone wants a copy of the list I've got, PM me your email address.
I've also got a PAL MegaCD list (again, 97 titles including the 32X/MegaCD combos) that I've been meaning to do some work with. It's on the 'to-do' list, but will have to wait until the MD list is done.