I found a web site called HealthCentral. They have a set-up a little less chaotic than many online forums for both depression (mydepressionconnection.com) and bipolar disorder (bipolarconnect.com). During my visit to the site, I happened to come across something called Mood 24/7 that caught my eye.
Mood 24/7, a free mood tracker, was developed by a HealthCentral-based on technology licensed exclusively from JohnsHopkins University to help one track his/her daily mood electronically. Using text messages and a secure website, individuals may signup securely and select a time to receive daily text messages asking for mood ratings on a scale of one to ten. Text message responses with optional notes are added to a personal mood chart (see pic above) that can be shared with doctors and loved ones, allowing everyone to see the effects of treatment in real-time.
You can read more about Mood 24/7 here.
I haven’t personally tried this product, but I think it’s a really good idea to have something track your mood and then develop the data into something visual, like a graph, that you could easily hand to someone else that should know how you’ve been feeling.