Life cannot get simpler than this. Here is Appcelerator, an open source RIA platform which developers can use for creating AJAX based RIAs with ninety percent less code, without Javascript or third party toolkits and that too in just one third of the time generally involved. It's a fully integrated RIA and SOA platform which brings together the benefits of RIAs, SOA and Web 2.0. Catch more info on Appcelerator out here.