man ascii
I find myself opening a shell and typing "man ascii" more than I would like. More recently, I've found myself looking (with no success) for a equivalent web page that isn't ugly -- sometimes a browser tab is just more convenient.
Yesterday, I decided to stop searching and just write one myself: man ascii. (I was a bit surprised that this domain, and all the variants of it Joker came up with, were available!) I think it gives me everything I got out of ascii(7), but I would love any bug reports.