100-question quizzes

Had an idea - not mine, but the excellent EQC revision quizzes here inspired me - to start writing some 100-question quizzes, of varying difficulty, that people can enter by email. I'll then keep a league table of everyone's scores.

There would probably be around a week to complete each one, though I'm happy to go with whatever people want.

Would anyone be interested? Please comment if so with any suggestions, and I'll add some details as to how it'd work.