In Eclipse PDE, when looking for resource changes (using IResourceChangeEvent), how do I find out exactly when a project is created? Do I have access to the project (as an IProject) in this context?
Several parts to this answer:
When resources change, your listener gets an event. From that event you can get a delta describing the resources that were changes. You implement a visitor (passed to the delta with the accept() method) that actually implements your response to the change and controls how far down the delta you want to traverse by answering a boolean from its visit() method. You probably won't traverse too much since any new projects will be at the top of the delta. Once you've recognized that you're visiting a delta node representing a new project (you use flags() and getKind() to see whether or not it's a new project) you can take whatever action you'd like.
The other part of this answer is to warn you that often resource changes are batched, usually for performance reasons, so you might get notified of a new project being created after many files have been created into that project.