Ask HN: iOS App Recommendation for idea/project management

I like to write down my ideas in text, sometimes draw out a mock-up, or add PDF's of something (documentation, screen shots etc) I wish to do this electronically on my iPad, but I dont know on any apps that are sort of an all inclusive notebook. I want to have an app where: - iPad native to maximize space - have many project ideas I have (each self contained) - write text about it - add existing jpg, png, etc - free hand draw - add PDF to the project - Save a copy to DropBox - being able to open this on my Mac to edit would be nice too. Does anone know of anything?