If you're interested in testing a build, sign up by sending an email to the address listed in Dial-a-fix.exe under the Contact/Visit section. Send an email to it with the subject "STL" and you will be notified when the first beta release of DAF 0.58 is ready.

Free STL registrations close 2006/03/31. Dial-a-fix v0.58 is scheduled for release sometime in early April (exact date to be confirmed).