Have you seen this? One of my favorite beers is going to twist off bottles. I wrote them an email and this was their response:
Thank you for your e-mail. We have been getting requests for years to make our bottles twist-off, and have been experimenting with twist-off caps for a few years, throwing in a batch here and there. In March 2005, all of our beer bottles are twist-off, with the exception of our 22 oz. bottles, which will always be pry-off.
Kind regards from San Francisco,
Anchor Brewing Company