The jQuery History Plugin is a extremely lightweight way to hook into history changes within the browser (for example when index.php#state1 changes to index.php#state2). It supports bookmarks, forward and back buttons, refreshes. Features include binding for generic/all states, specific states, and multiple binding (overloading). It is the only history plugin that I have found which actually supports all browsers (firefox2,3,3.5, safari3,4, ie6,7,8, opera9,opera10) withouts quirks.

Lightboxes are a way to display an image on the same page simply and elegantly.

Features:

• Lightboxes can be grouped together.
• Titles and descriptions for images.
• Additional files are included automaticly. So you only have to include one js file, and it does the rest.
• New/optimised design and transitions.
• Provides many easy automatic and manual ways of creating and starting lightboxes.
• Easily configurable via many options, and extensible via custom events. So no file modifications are required.
• Lightbox automatic scroll and resize functionality. Eg. If the image is too big, it is resized.
• Only 21KB in size (as of v1.3.0-rc1).
• ColorBlend support.
• Proper jQuery Plugin.

Take a look at the demo site http://www.balupton.com/sandbox/jquery_lightbox/ to see it in action, as well as examples of it's usage.