The IE test center has a bunch of tests that fail in WebKit: http://samples.msdn.microsoft.com/ietestcenter/ It seems likely that a number of these represent problems that we should fix. We're tracking the failures in this spreadsheet: https://docs.google.com/spreadsheet/ccc?key=0AppchfQ5mBrEdHAtbzNvcFdfSlBBbGN0NjY1UFlLYlE&hl=en_US#gid=0