I don't know if this is something that everyone else has noticed already - it may not mean anything, but I noticed that the icon for "Notes" in the upcoming Leopard mail is pretty much identical to the "Notes" icon on the iphone. If they lead to the same functionality, that means that any notes you take can be kept on an IMAP server. The interesting thing to me here is that if this is true.. then I can take notes on my computer via the Mail program, and they will automatically be transmitted onto my phone without having to sync and vice versa. You could think of a thousand things that you could do with this kind of setup. For example, how about the ability to have a "common" notepad between different people. My wife and I could really use this. Notes that she takes on it during the day will just show up on my phone.  Along with Leopard, Apple is supposed to release all sorts of collaboration tools. For example, an iCal server that will allow a group of users to share calendars. It's not a far stretch to envision a notes collaboration.

Anyway - more random speculation.  I've enclosed a picture of the two things side by side.