As in any other products there are many added new features, updates and bug fixes with every new releases. Refer these release notes to get the added features
6.0 - http://docs.adobe.com/content/docs/en/aem/6-0/release-notes.html
6.1 - http://docs.adobe.com/docs/en/aem/6-1/release-notes.html
Let us know which version of CQ are you using and if you are looking at any specific difference