Now you can optimize your major images through site .Google now support images in site map . Image tag is <image:image> <image:loc> </image:loc> </image:image> read the full article at: http://googlewebmastercentral.blogspot.com/2010/04/adding-images-to-your-sitemaps.html
I have read it on Official Google Webmaster Central Blog. But still thanks for sharing. It is much helpful to be able to add images to site maps.
Consider always doing things compatible with standards defined at http://sitemaps.org/protocol.php#xmlTagDefinitions. If google is implementing non standard definitions, then your sitemap might well be rejected by other search engines.
its great post. now we can optimize image through the sitemap. we can add the images in sitemap so that google can find images from our website.
I have problem when add image to sitemap.xml. when i add image tag to sitemap.xml. Webmaster tool can not read my sitemap. I don't know why that is. pls help me Thanks