Bookmarklets
Bookmarklets are bookmarks which contain small amounts of JavaScript code that you can execute on demand. There is a whole range of things they can do and some of them can be very practical. There are no risks in trying them out and using them full-time, so I suggest you give them a try. You’ll probably never want to give them up 
. Here’s a list of sites that have bookmarklets worth checking out.
Jesse’s Bookmarklets Site - you can find a whole bunch of bookmarklets here… some of them cool, some of them useful, some of them practical… some of them complete rubbish and counter-productive… choose the ones you like
The following few are from the same developer:
Favelet suite - This opens a menu with all kinds of kinky developer stuff. Check it out.
Mouseover DOM Inspector - this is actually a web developer gadget. If you’re not a developer, believe me, you don’t need it.
Text to Link - Converts all URLs in the active document to links. Great for forums and similar applications.
