Bookmarklets: Which do you use?

I've been interested in bookmarklets for quite a while now, starting with a bookmarklet that takes the current page you're at and jumps up a folder which is quite nice when Google drops you a number of levels deep in a site and you want to see what's up a level especially if you end up on a 404 page (An example of this bookmarklet is called "Up a Directory" which can be found on the Bookmarklet.com's Navigation category).

With the advent of Firebug, I've generally been stopped using them less and less often. I do keep Firebug Lite around for working with IE and Safari, and I will pull out MRI, XRAY from time to time and when I have some layout issues I may use Spry Media's Grid and Crosshairs bookmarklets (not to be confused with Adobe's Spry JavaScript framework).

And there's even some bookmarklets out there specifically for working with the Firebug console. For example, there's jQuerify which dynamically adds the latest version of the jQuery library to the page so that you can run some jQuery selector searches (or anything else jQuery) from the Firebug console.

Are there any bookmarket's that you use and what you use them for? Please share a link to the hosting site.