Can I use IronPython to develop GUIs for Google App Engine?
Google's Google App Engine can only run pure python code, and not even all Python is supported.  No, you can't do things like IronPython.
If you want to use Python, I'd learn Django.  If you want something closer to .NET, I'd go with Java.
I'm developing a simple Python program with a (dynamic) form interface, but it needs to run on Google App Engine. I understand that IronPython lets one use Visual Studio's drag-and-drop interface builder and classes while programming with Python, but will this be compatible with Google App Engine?