Yep. Stumble Upon was great for that. Using it was like pressing buttons on a slot machine. I think Stumble Upon lost it's way soon after they dropped the Firefox toolbar in favor of the integrated iFrame. Only Yahoo! when it first came out, made me feel the way SU did.
Yep, this ! I stopped using StumbleUpon right after they decided to ditch the toolbar. The whole use case for StumbleUpon was to not visit a specific site but rather discover new ones. I used to absolutely love reading comments about the suggested pages as much as I liked the suggestions themselves. I also liked the tagging and searching through tags ..it was a bookmarking, social, reviewing, recommendation toolbar ...and then they went ahead and killed it trying to replicate arsebook or whatever.
StumbleUpon had a Firefox extension up until the last, but the original toolbar was a victim of Firefox's removal of XUL/XPCOM extensions in newer versions. Firefox has made a lot of improvements lately but I still miss the broader, more powerful variety of extensions that Firefox used to support.
