I came across this and after looking at their gallery I was really impressed at the look of it.

Information from the main site

jQuery.spritely is a jQuery plugin created by Artlogic for creating dynamic character and background animation in pure HTML and JavaScript. It's a simple, light-weight plugin with a few simple methods for creating animated sprites such as the birds you see on this page, and dynamic scrolling backgrounds.

You can use it on any html web page, and any part of the page can interact with a sprite

Spritely has the following great advantages
•it works well on iPhone/iPod Touch/iPad - check out this page on an iPhone.
•It has been tested successfully on all the major browsers - even Internet Explorer 6
•it's a great alternative to Flash if your desired platform does not support it.
•it's light-weight so you can do fill the whole window with movement without draining bandwidth.
•animated objects can also fly above the text of a web page, or you could animate a background, without affecting other elements on the page.
•you should be able to make fully accessible web pages in pure html and javascript without any problem
It's provided free as long as you comply with the license
Dual licensed under the MIT or GPL Version 2 licenses

The main site
I recommend checking the gallery out, really cool looking for those who don't like to use flash but like the look, and I noticed its not hard on your resources as well +++++