Using iPhone and Mac for Notes - how?

I'd like to be able to view and edit notes on my iPhone and Macbook Pro. For example: it is convenient to type the longish parts of notes on the laptop, yet e.g. in the case of a shopping list I don't want to carry the whole thing with me to town. However if I think of something to add to the list while I'm on my way, I'd need to do so on the phone. The only mediocre solution I've been able to come up with is to use the Notes feature of Mail.app and have an IMAP folder this is stored in which I can also access with the phone. This solution is mediocre for at least two reasons:

1) Can't edit notes on the iPhone

2) Notes aren't automatically backed up by Mail.app, rather I have to click "Done" on the laptop, thereby closing the note, to store it on the server.

Another solution I thought about is using the Notes application built into the iPhone. However as far as I can tell Notes can't be wirelessly synced (not even with MobileMe membership, wtf?), and those notes can't be edited on the Mac in any event.

It seems that sharing notes between Mac and iPhone would be the single most obvious software feature to have, so I'm 90% sure I must be missing what is already there in OS X.

Thanks for reading and your ideas...

 

Thanks. This works OK as long as I keep the phone connected to the computer, to close Notes on Mail.app before leaving, as well as to sync before I disconnect. In real life it seems to be tricky to always remember these thing.

Would it be difficult to write an application that syncs wirelessly? Apparently it would be, otherwise that application would exist, or it would be part of MobileMe.