If you’re interested in finding out about beta exams, it’s a good idea to stay tuned to the “Born to Learn” blog anyway, and you’ll also want to check in on the certifications postings there as well. In fact, a quick jump over there right now shows a recent (9/17/09) posting on the Windows 7 Professional exams (685 and 686) that explains how people find out about open betas so they can sign up and particpate, primarily by filling out an SME (subject matter expert) profile and indicating interest before the beta exam sign-up period begins. There’s even a Beta Exam Announcements blog where you can find out about all the ongoing and upcoming beta exams at Microsoft at any particular point in time.

Now that you know how to find out about exams, how to get considered, and where to look for information, all you need to do is get lucky enough to check about one week in advance so you can indicate interest, and snag an invite or get a beta registration code. Good luck!