I just got this email from Shutterfly today!! Get a free 8x8 Photo Book ($29.99 Value), but you'll have to pay shipping. I don't know if it's only for people who got the email, but here's how you can find out if you have this offer:
Log into your Shutterfly Account
1)Go to My account
2)Click Enter a Code
If you have this offer it will be credited to your account. The offer expires on May 26th. If the code doesn't work for you, it may be an individual code. Check your email to see if you have got one from Shutterfly.