I was interested to read of Jody's enthusiasm for the iPhone and mobile learning (which I share).
I'm currently sitting by the Thames, taking a break from my walk to work and writing this post to my blog using my iPhone and an application called iBlogger. There are lots of other ways of doing this - using notes and email for example.
I like this ability to record the here and now (with text, voice, image) to share or to come back to later to re-edit.
BTW, the Shelfari site looks great.
Mobile Blogging from here.