Microsoft put out a new Reference Architecture Guide on running RDS (Session-Based) in Windows Azure. Download it here!
Also see my earlier posts on RDS in Azure related to this Reference Architecture Guide:
“…Summary: This document defines a set of architectural blocks for using Windows Azure Virtual Machines to create multitenant, hosted Windows desktop and application services, referred to in this document as “desktop hosting.” The primary goal is to enable hosting providers to create secure, scalable, and reliable desktop hosting solution offers for small- and medium-sized organizations with up to 1,500 users. The intended audience for this reference architecture is hosting providers who want to leverage Windows Azure infrastructure services to deliver desktop hosting services and Subscriber Access Licenses (SALs) to multiple tenants via the Microsoft Service Provider Licensing Agreement (SPLA) program. To deliver a desktop hosting solution via Microsoft’s SPLA program, hosting partners leverage Windows Server and the Windows Desktop Experience feature to deliver Windows users an application experience that is familiar to business users and consumers. Although Windows 8, Windows 7, and earlier Windows client versions are not licensed for SPLA, the Desktop Experience feature in Windows Server 2012 provides a similar user experience and application support.