Twitter has a nice feature to save searches so you can quickly access them quickly in the sidebar.
It would be nice to have something like that for SO/MSO/SU/SF.
Instead of having to type in my search, like
[discussion feature-request only-awesome-features]
in the search box every time, I could save them as a search preset and access them in my prefs in a tab called "Favorite searches" or something like that.
Even better, the saved searches would be available in the site's sidebar, e.g. under related tags.
EDIT: I know, the search is not the best, but searching for certain tags or groups of tags (in the syntax: [tag1 tag2 tag3]) actually works ok, IMO. That's what I want to use it for, searching for certain groups of tags.