Last comments! What I really regret not doing, was taking a daily photo.. I do have a couple of photos (by luck, not by planning), Also, get a tape measure!

starting point, began cycling to work about 2 weeks after this photo was taken (~118 kg, ouch)

http://www.arcturus.com.au/sean/2009-09-15.jpg

6 months later with riding every day and body weight exercises (~97kg)

http://www.arcturus.com.au/sean/2010-03-22.jpg

I would highly recommend taking some photos, because you don't notice changes yourself, everyone else does. :)