This version of Beagle features a brand new user interface, formerly codenamed Holmes, which is a vast improvement to the user experience over the older UI, Best. This new UI features native widgets, a more effective use of screen space, grouping by document type, and much, much more.
You can see a screenshot of the new beagle-search in action here:http://beagle-project.org/images/5/54/Beagle-search.png
As a side effect of this new user interface, the dependencies on gecko-sharp 2.0 and a Mozilla runtime (either Mozilla, Firefox, or XULrunner) have been dropped.
This version also features a plethora of bug fixes and myriad new features. Among them, the dreaded tmpfile bug has been fixed, and memory usage should be much improved in this release.