[DanBC]

Readability - through searching (also HN recommendations) because many websites delivering text do so incompetently

Pinterest Pin It - I used to enjoy Pinterest. I recognise they engage in some user hostile stuff, and that the mobile experience is sub-optimal.

Amazon's Add anything to wishlist bookmarklet - it's an easy way to create a nice wishlist. I would happily use something that took me out of Amazon.

Hacker News bookmarklet - it's a nice way of submitting articles, although I tend to do that manually nowadays.

I used to use "Track Me Not", an art plugin that generates a bunch of search traffic. I'd use something that did this properly.