Opt in to Kindle Special Offers?

3rd and 4th generation Kindle owners who are curious about Special Offers may be able to opt in to  Special Offers according to blogkindle.com:

The Kindle 3 (Kindle Keyboard) definitely works, and all newer devices should handle it without any trouble.  If you haven’t had a chance before now to check out the options, it might be worth a try.  Just today I’ve seen a couple tempting ones flipping my Kindle off and on.  I especially recommend if you are in an area covered by the AmazonLocal deals.  Amazon is clearly not pushing people into this, nor do they make it hard to change your mind.  If there’s value to be found, why waste the opportunity?

It's too bad I have a 2nd generation or else I would be looking through the options right now!