Today I am messing around with the Firefox extension from PLB, the teacher's toolbar (it is also available for IE). So far I am liking it, although I don't usually like extra toolbars or sidebars eating up my screen. The toolbar features a Google based search box and drop down boxes in a variety of catagories that hold links to check out. Some of the catagories are Professional Development, News (links to mostly ed related blogs), Classrooms, Tools, Tech, Jobs, Ask&Tell, Grants and Safety. There is also a radio tuner (love it!), Skype link, Weather button and an Email Notifier.
It is worth trying out for a week or two and seeing if it is useful.