AzureCdn.Me.Nant contains a custom build of YUI Compressor that adds a new parameter to the cssCompressor task allowing you to append a query string onto image refs in your css files, thus invalidating them on the Azure CDN cache
amend is a cloud-based service that provides an end-to-end image management solution including uploads, storage, manipulations, optimizations and delivery.
Out-of-box support for Compass, Require.js, live reload, CDNs, minification, bundling and revisioning - everything tied together with Bower, fully configurable via Grunt scripts and integrated with MsBuild/MsDeploy.