I would like to see tables showing how often a player rated 100 points higher than his opponent is expected to win, 200 points higher, 300 etc.

This link

http://www.schaakbond.nl/knsb/handboek/knsb-commissies-en-hun-reglementen/Rekenregels%20KNSB%20Ratingsysteem.pdf

ignore the foreign jibberisch go to page 7.

Knock yourself out: 

nb (0,5150 means it is expected that the higher rated player wins 51,50% of the games)

Thank you Artsew, however I still think that it's something that this site should provide.

ah sorry, missed the forum it was on. Saw it at the "most recent posts"

Good idea.

USCF has an exact percentage table on their site (specifically rating section)

Different organisations use different formulas.

But they are all similar. FIDE is 100 points lower than USCF usually

Well on this site, for example, they could show stats of the relationship between ratings differential and win ratio, just using the games and ratings of this site.

They could

Yes,that would be interesting