Org-mode always seems cool but I have never really gotten around to trying it out. What I find myself needing lately is a universal input system that lets me send it data from emacs, web, email, and mobile, as well as easy review and categorization and all that jazz. Ideally I'd be able to take that and directly reference it in an emacs buffer while I write a blog post or something.
I find that the easiest way to categorize email, especially when I need to generate a todo item from it (to be later ignored among way too many todo items), is to link to it from an org-mode buffer.
That iPhone app looks cool. I was thinking more along the lines of being able to email a special address and it automatically getting appended to an org buffer, or something like that.
Org-mode links can point to all sorts of content including email, web pages, specific lines in files on your system, etc... see http://orgmode.org/manual/Hyperlinks.html
Any ideas?