For all new starters in the Windows Azure world – this is a zero-commitment offer to dip your toes into Windows Azure. The only caveat is that anything you put up there will vanish after the 30 days expire. Only one per person.

http://blogs.technet.com/b/webtech/archive/2011/07/28/it-s-back-30-days-windows-azure-platform-no-credit-card-required.aspx