>>11817026TDC doesn't provide disk images, only collects the pre-installed files, or in some cases the installer files as an option. It's still the biggest collection out there.
There are efforts to collect floppy images but they aren't as complete (TOSEC, Good Ol Days, Digitoxin)
For CD games, Redump is good.
>>11821227This is the sad truth, these guys have no choice but to try and clean up the files themselves, though they also try to find untouched floppies if it can be helped (i.e. if a game came in 3 inch and 5 inch versions, one of them is likely to be untouched)
I've heard legends of the original version of Wizardry (for the Apple II) contained some once-per-floppy events, so that's the sort of stuff they're dealing with.