First off, here's a very detailed NSFE tutorial by bucky if you're interested in helping.
2nd, this is a spreadsheet detailing every NSF out there, and its NSFE completion status. if you're looking for games to claim, it's important to note the color next to the game in the NSFE column.
Blue = NSF is available to claim.
Yellow = NSFE is already done, or being verified.
Red = Work in progress. If you claim a game, the blue cell should be changed to red.
Where to download NSFEs:
TheWiiGuy's NSFE dropbox - just get everything here. It's the most complete and up-to-date collection out there
^ Part 1: NTSC
Part 2: PAL-only, unreleased, cancelled, prototypes
Part 3: Famicom (Japan-only)
Part 4: PAL versions of NTSC games
Part 5: Unlicensed, bootlegs
Part 6: Hacks, Homebrews, Overclocked, Covers, Fixes, Old / outdated versions
the rest of this OP preserved for no reason in particular