Looking for another older post I came across this... sorry if its late or whatever... I use Backloggery and FACEBOOK. Yep, there is a nice app on Facebook that lets you add your games to a list and check off 5 things
Collection, playing, favorite, Wishlist, and Finished
as of right now I dont see a TurboGrafx option (but I sent them a message)
The games systems they list to add from are:
Nes, Snes, N64, Gamecube, Wii, Gameboy, Gameboy Color, Gameboy Advance, Nintendo DS, Virtual Boy, Wii VC, Xbox, Xbox 360, Xbox Live, Psx, Ps2, Ps3, PSP, PC, Mac, 3DO, Atari, Sega genesis, Sega 32, Saturn, Dreamcast, Guides, Hardware. and a few that are abbreviated that I don't understand.

I just noticed they already added a TurboGrafx 16 option