Looks good! Very clean and easy to read.
Regarding double and single opt-in, I suggest you read this:
http://answers.google.com/answers/threadview?id=234634
Quote:
Benefits of Double Opt-In:
"You reduce the risk that someone will forge addresses, especially to
trivial or offensive newsletters and email-marketing lists."
"You also reduce the risk of being labeled a spammer and losing your
Internet service, because you can show that every recipient asked to
be there."
"Your subscriber base is more valuable to advertisers because they
also know that subscribers are there by choice, not chance."
Moving onto the benefits of single opt in Ezine-Tips had this to say:
"You can build a list much faster if you send a subscriber
confirmation rather than waiting for subscribers to confirm. Some
figures show only 50 percent or fewer subscribers confirm."
"Single opt-in works for newsletters that appeal to a niche or tightly
focused market that pranksters are less likely to frequent."
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Hope that helps
