From the Zune Team:
The Zune service will be down for scheduled maintenance on Tuesday, June 16, starting at 12:01a.m. PDT (2009-06-16 0701 UTC) for up to 24 hours. During the downtime, Zune Social, the forums on Zune.net, and all of Zune Marketplace will be offline.
We apologize for any inconvenience this might cause you.
Please check back soon. We look forward to sharing our picks, plays, and recommendations with you in the Zune Social and in Zune Marketplace shortly!
Your Friends at Zune
Zune Privacy, One Microsoft Way, Redmond, WA 98052