For readers who get my blog posts in your email via Feedburner, your subscription has been converted to a different service called Follow-It. You will continue to receive updates but you must confirm the change (you should receive an e-mail asking you to do this). You can also just re-subscribe by clicking on the sign-up link at the top of the right column.
I apologize for the change. The reason behind all this is that Google is discontinuing the Feedburner service. This affects not only my blog, but any other blog that you subscribe to. My apologies and thank you!