When I attempt to delete a blob from my storage account container, I get an error message, \"There is currently a lease on the blob and no lease ID was specified in
You need to delete the disks from the Virtual Machines section of the portal.
Check this MSDN blog post for the complete instructions: http://blogs.msdn.com/b/windows_azure_technical_support_wats_team/archive/2013/02/05/iaas-unable-to-delete-vhd-there-is-currently-a-lease-on-the-blob.aspx