a) I was bored of the old look
b) I am completely and utterly lacking in web design and programming skills.
The other day someone asked me if I have a blog feed, and I was all, "I don't know, but it sounds delicious!"
I have since educated myself about feeds, and discovered the wonderful time-wasting properties of Google Reader in the process.
Thanks to you, Mark, I am now at least 33.3% less productive!