I have wanted to try GAE since launch, but coming from ASP .NET and VS, I couldn't find development tools I feel comfortable with.
As I want to use this to get comfortable with non-Microsoft technologies, I don't care which language I use, be it Java or Python, plus having no idea about any of them I hope this is a good form of taking my first steps in.
What I just want to know are options for development tools and where to dig for information.
And, of course, if I'm of the hook, I will be happy to hear any idea to get on track.
Thanks!
If you're coming form the Visual Studio world, you're best bet for developing may be using Eclipse. It has plenty of support for Java, Python and GAE as well as many other sundry things.
If you are ok with using Java, I strongly recommend using Eclipse. Google provides tools for eclipse for development and deployment to the App Engine directly from the Eclipse IDE. See this tutorial Writing Java Hello World for Google app engine to get started.