Sync a folder with Mobileme?

I'm trying to get a couple of folders on my mac to automatically sync to my idisk. I'd like the idisk to update when I create new files in those folders on my computer. My reasoning: I'm trying to sync folders with notes/projects/essays so that it would all be readily accessible from my iPhone through the iDisk Application. In other words, I could outline a chapter on my laptop, then reread the notes on my way to class on my iPhone. How can this be done?