[...] I found this blog post, which mentions a new Open Source effort by Amazon to allow users to control/manipulate their EC2 instances via a FireFox plugin. At first I thought it was an odd design choice - controlling a virtual machine with a browser-specific application - but I decided that it’s really, really cool. I would rather have a Java applet-based Command-and-Control application, but this is good enough for what I need. [...]

[...] Amazon?s EC2 Open Source Firefox Plugin - Developers using Amazon?s EC2 API might find this interesting: Amazon has created an open source project on SourceForge for ElasticFox, their Firefox extension that lets you create and manage EC2 instances from a GUI in the browser. [...]

I’ve just found a nice app that supports S3 and EC2 and has a nice GUI: http://www.jollat.com