The biggest innovation has been the introduction of the Ribbon to Microsoft Excel 2011 which makes navigating and editing your documents much easier and brings it into line with the Windows version. It's also now part of Office 365 which integrates Microsoft Office with the Cloud.
Microsoft Excel 2011 is part of Microsoft Office 2011 and has been given a through revamp since Office 2008 including a slicker OS X style interface, lots of new templates and new sharing options.
