If you missed the first round of beta applications being accepted last year, now's your second chance for an early look at Raph Koster's Metaplace. According to an announcement today, their brand new temporary website is up to promote an expanded beta and their mailing list, both of which you can sign up for quite easily.
To sign up, simply go to the main webpage and click on the "Apply Now" button on the upper left-hand side. From there, you just enter your name and email address, and they will contact you when they're ready. It's as easy as that! Also, look for their newly-designed website to launch soon, as they prepare for what might just be the long-awaited final stages of Metaplace's development.