PopCap's giving away free copies of Peggle Nights to anyone that signs up to receive the company's newsletter.
Just journey over to the PopCap website and look for the newsletter block in the bottom-right corner of the page. Then click "sign me up" and follow the on-screen directions. Eventually you'll be verified and be given a few limited-time discounts as well as a free copy of Peggle Nights to either email to a friend or to yourself.
Peggle Nights, released late 2008, followed the immense casual-to-core crossover success of Peggle Deluxe. While there was little to recommend Nights to those who already had Deluxe, anyone ignorant of the pleasures of Peggle need make excuses no longer.