I was looking for such plugin to generate image sitemap as I was using Google XML Sitemap for posts but was not having anything for images. Google is making design/layout change in Google Image Search and chances are high for getting traffic from there as Google is now showing 1000+ images on single page.
Thanks Amit for this light but awesome plugin. Looking forward to get more from you on WordPress and related stuff. Anyway, Liked the idea of showing your Facebook fans on settings page of plugin. :)