I’ve been checking in on webinars and the website of this group for a few weeks—the site’s called whichtestwon.com and it’s an email marketers dream.  Here’s a link to their Best Tests of 2010 Testing Awards Case Studies.  It’s chocked full of great information on other marketers A/B tests of their emails, landing pages, buttons and so forth.  They even offer you the opportunity to get interactive and pick which design you think had a better conversion rate.

Enjoy!