I use a catchall and give different email addresses to everyone. I've received 3 spam emails in the past month to my dropbox account, but they aren't the only ones with problems, for example the following are the number of spams for various sites: * 2 emails Foursquare * 6 emails Groupon * 6 emails Rackspace * 25+ emails Ticketmaster * 50+ Absolute Radio (UK Radio station)

Absolute Radio was hacked, not sure about the others.