I have occasionally played one-on-one two-board simuls: that is, two players, playing two games of chess, against each other, simultaneously. (Not to be confused with bughouse - no piece passing takes place).
This concept would seem to scale pretty easily with web technology: play any number (well, probably an even number) of games between two people simultaneously, and the score for the match is how many games you win.
You could then have a tournament in this format: each pairing is not a single game, but X simultaneous games (maybe 4 or 8 is a good number).
Has this been done? What is the name for this style of competition?