I was reading a blog from Matt Berseth(http://mattberseth.com/blog/) and noticed a mention to this tag of Canvas from HTML. The word Canvas I can associate with Silverlight, WPF, Flash and Flex I think etc... but I never knew about HTML (designed by Apple I have later read). A nice GDI for JavaScript, and the response time seems very good as you can see in this link I found from the Mozilla developers site:
http://www.abrahamjoffe.com.au/ben/canvascape/
You will notice the designer says "Google's work around code" to make it compatible with IE. I wish there was a link, as I cannot find on Google.
Cheers
Andrew