If you include various information disclosure incidents, I counted 23 or so, and then a bunch where I can't recall exactly what the address was used for at some point in the past.

Adobe (twice), NetTeller (twice), Boxee, IceTv, LinkedIn (a few addresses), TheTVDB, Paypal, some old forum sites, ableton, dropbox, last.fm, plex, smartdraw, PokerTracker, PartyPoker, several other poker related sites, some shopping discount sites, various small restaurant sites and tourism email addresses, various quote aggregator websites.