There are a lot of improvements made into V2.5. The page editor has been completely rewritten in JQuery. As a result you will notice a significant performance improvement when using page editor. Blog module has been enhanced as well. We added new blocks such as Tag Cloud, Article Archive, Recent Comments etc.
Visitor source capture has been improved in V2.4. If you use Google Analytics to track your site trafic, this matches with GA to capture visitor source without any configuration. When visitor registers or places order, the source will be automatically recorded. You can then run report tool to show metrics.
In the new version 2.3 we improved one page checkout process. Now the step indicator can guide customer via the checkout process. If customer is not happy with the one-page checkout, he can switch back to the regular multiple-page checkout.
In the new version 2.2 we added new features such as page group, SEO improvement, multi select product attribute, digital downloads, user referrers and two new server blocks: download button and content group list.