Hi, Jonathan,

I'm one of the developer of MercuryApp that is using Notifo for our notifications. It is the application that he uses to track his mood. We are opening up in the next few weeks, although you can request a beta invite at www.mercuryapp.com. We've got some great features coming out to make it even more useful as a tracking tool.

Yeah it's quite cool. I used a combination of Google calendar reminders and Posterous to do it a while ago.