I'd love a "Bookmark selected tabs" kind of function that lets me quickly click on a dozen or so relevant tabs. Usually, I'll have 20+ tabs open with 5-10 on a given subject, so "Bookmark All" captures a lot of useless tabs.

Better yet, a "Bookmark similar subject" plugin would be awesome - Leverage Google's search to automatically figure out tabs that are about the same thing and bookmark them by subject. Ignoring pinned tabs would be a bonus.