A bookmarklet is a small JavaScript program that can be stored as a URL within a bookmark in most popular web browsers, or within hyperlinks on a web page. Because Internet Explorer uses the term favorites instead of bookmarks, bookmarklets are also less commonly called favlets or favelets.
Bookmarklets can be saved and used like normal web page bookmarks. Therefore, they are simple "one-click" tools that can add substantial functionality to the browser. For example, they can:

BookkooB Search - Searches a webpage for ISBNs and shows price details from UK or US online stores.
Bookmarklets - Information on Bookmarklets and a collection for download.
Meta Description: [ Bookmarklets - Free tools for power surfing!; Tiny tools you keep like bookmarks for better surfing and searching. Work for Windows, Macintosh, Unix, on Netscape or Explorer. Each tool is a small JavaScript application which you can bookmark directly from the page and use from your Bookmarks or... ]
Bookmarklets - Browser Power - Collection of bookmarklets and instructions on how to write them.
Meta Description: [ Lots of bookmarklets. They are power tools for your browser that allow you to enhance the functionality of any web page. ]
Bookmarklets for Opera - Several downloads for the Opera Web browser.
Meta Description: [ Free tools for power surfing with Opera. Each tool is a small JavaScript application which you can bookmark directly from the page and use from your Bookmarks. ]
Centricle: Favelets - Personal collection of bookmarklets for Web development and search engines.
Creating a Bookmarklet - Basic introduction to utility browser scripts.
Meta Description: [ Learn to write your own Javascripts or just want prewritten scripts to plug into your pages. JavaScript tutorials, how-tos, sample scripts, and more from About Guide to Javascript - Stephen Chapman. ]
Creating Bookmarklets - JavaScript programming tutorial explaining how to create bookmarklets.
Jalarie: BookMarklets - Several samples and a bookmarklet editor.
Meta Description: [ Store JavaScript functions as bookmarks. ]
LibraryLookup - Tools for looking up catalog records from book-related sites.
Sam-I-Am.com: Bookmarklets - Sample tools for download.
Squarefree Bookmarklets - Information, resources, and several downloads.
WorldTimZone Bookmarklets - A variety of bookmarklets including search engine, web development, and religion-related ones.
Meta Description: [ Bookmarklets (short javascript bookmark programs) that I use all the time. ]
| that denies all of those annoying Facebook application requests with one-click of its bookmarklet. http://ignoreall.com ... | |
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