In a Google Base blog post entitled Plastic Surgery:
“You can now view some types of information in a table — or a grid, if you prefer. We updated the sorting and refinement user interface to be cleaner and faster. (The more technical among you may notice we’re using the fun and friendly Google Web Toolkit for the AJAX features.)”
The same Google Base blog post also discussed the new ability to rate Base items and write reviews. Will check out the changes in more depth tonight.