I'm working on an app that is somewhat related that you can check out.
You can view it as a demo user here:
(logout to create your own account)
I can't test at work right now, but WOW, this actually looks pretty interesting and more that I was really thinking of - but with the capablities of the iPhone this might be the type of revolutionary hybrid app of the future! I like that it seems more intuitively flexible that a standard task list - which most lists these days could use. After all some lists I have (say as a nightclub promoter), are really reminders of shared tasks which the blog aspect could maybe even be used for.I can see where the blog could actually "publish" certain tasks for me to share with others as they are completed (I wonder if a blog like this could even be password protected?) Other times I also am saving a quick email address or website. Would these be able to be hyperlinked I wonder?
As for the actual functionality, if you look at Outlook for instance, you can tag and sort (and view) by drop down menus for date or status but you can also enter your own catagories and sort view or hide accordingly. Looking at your demo perhaps the editable title category would be possibly be enough for me as a first level of viewablity (and to keep it simple), but then as you view the actual note if you had a sortable date due (and/or status column)you might really be onto something. If you could have a hot-key to drop in a check-box (could even be a bullets ala Word) on the fly that would be hot! I esp. like the idea that this would be easily accessible like a "locker.
I may be highly caffinated today and have a case of iPhone fever, but I find this very interesting!