I should have elaborated on that.
- Everdo does not aim to be a project planner/outliner. There are way, way better tools for that. It all comes to the the trade off between the ability to see the big picture and the simplicity of finding the suitable next action to focus on. Everdo focuses on the latter, which means large-scale plans are better made in a more suitable tool and moved to Everdo gradually as parts of the plan become actionable.
- Another thing is that making nested projects seamlessly work in a GTD manner is something I cannot envision so far UX-wise.
What kind of integration do you envision beyond http-linking the note (already possible)?
Simple formatting is likely to be added - see Formatting in the Description/notes, Markdown Support - #2 by Andrei for a bit more info