The new Content Finder, which appears in the left pane when working on a page, represents an important productivity improvement. Behind the scenes, a complex query runs to show things that you might want to add to the page -- perhaps recently uploaded images or documents that you used in the past. Even more impressive, when I installed connectors for Documentum and SharePoint, assets from these systems also appeared. To situate any of these objects on a page, I just dragged them into place.
In addition to the context-aware menus, you can work on pages through the "sidekick" widget. I found this preferable when developing intricate layouts. That's because the sidekick provides fast access to the many available pre-built components, which range from slideshows to text areas.
I was very pleased with the system's fast response when dragging these components on to pages and then reordering; there was no screen refresh lag. More important, changes were immediately committed to the repository.
My site, your site
Perhaps the most important new capability, from a Web 2.0 perspective, is the way CQ5 handles personalization. Every site visitor is potentially a registered user with a unique profile. For example, you could match profile information with tags placed on a page to deliver content tailored to the person's interest.
Taking this further, each site is really a Web 2.0 portal. In my test intranet, I easily allowed each employee to add a Google Gadget to their home page. Because I knew each user's identity based on their log-in, it was easy to give them rights to upload documents or comment on a blog entry.
CQ5 introduces social search -- something that other CMS products usually make you buy from another vendor. I found that anonymous users got very good results. However, when the application compared previous queries of registered users who looked for the same information, the results more accurately reflected their common interests.