If you're like me, Wikipedia is your go-to site for all things research and definition. Read something in an article you don't understand? Wikipedia! Friend use an obscure TLA? Wikipedia! There is almost no end to the community edited encyclopedia's usefulness.
Most visits I make to Wikipedia are just quick fact checking and the like, but every now and then I am pressed to do some good old fashioned actual research; the kind grandpa used to do in the library. For those situations, Pathway is my new best friend. Pathway is a desktop interface for Wikipedia that not only lets you view wiki pages, but keeps a history of the pages you view, and displays your history in a sexy-sexy data map. I've only just started playing with Pathway, but its sleek look, original features, and light usage footprint have already earned it a cozy new home in my Applications folder.