I recently switched back to double opt-in, and was a little discouraged by the drop in retention.
I stumbled upon a warrior post about adding a "bonus" on your thank you page that people get when they confirm.
I implemented it a couple days ago and my confirmation rate went from about 40% to 65% and up.
I cut my squeeze page down to just a head line and a sub-head (from a full page of copy) and I'm now getting 5x the opt-ins I was.
Here - feel free to check out my thank you page and squeeze page.
And also, if you're doing things to make confirmation rates go even higher, let me know! I'd love to find out.
Thank you page:
Copywriting Secrets Unveiled