What caught my eye this morning was this Guide to Most Useful Bookmarklets for Chrome, Firefox, Safari, etc. from the Digital Inspiration Technology Blog.
Readability of course is in there, but also things like :

PrintWhatYouLike – A brilliant bookmarklet that helps you format web pages for printing. You can save changes locally as a PDF file (more ways to reduce printing costs).

and

Short URL – This is too obvious but still a must-have bookmarklet. It lets you create short URLs for any site using bit.ly, a service that is far better than TinyURL as it offers real-time click statistics.

Many of these bookmarklets look like things I’ll be using daily