After the release of Google Chrome I changed my default browser from Firefox to Chrome. I was a fan of Firefox but Chrome was what I've been waiting for because of its speed and some other features. I was using a lot of extensions in Firefox, but now as I am using beta channel releases I don't have extension (plugin) support yet. So I entered the world of bookmarklets. I know they are not as efficient as extensions but they serve some of my intentions.
Here is the question: I wonder if I am missing some very useful bookmarklets. What are the most useful bookmarklets for a superuser who do not have extension support?