The display filters used in the proxy history and site map are now more powerful, and allow you to filter on:
Simple and regex search terms (Pro version only) - this is often handier than using the suite-wide search function.
File extension - this supplements the MIME type filter, and is useful for unusual content types, and when HTTP 304 responses do not contain any content.
Annotations made by the user.
The new filter configuration panel looks like this: