IMHO, a major benefit of a successful todo/project management app is 24x7 access. I have an iPhone, iPad, Mac and PC. Access from the iPhone and desktop are IMO the two priorities. The iPhone is 24x7 while the iPad is not, at least not for me, since I carry my iPhone with me at all times (as my BB before that) but not my iPad. Therefore I propose improving the iPhone interface for less cumbersome entry and the desktop for more robust reporting features over an new iPad version.