If you are evaluating Windows Azure Virtual Machine and planning on installing SQL Server in the virtual machine you should review this handy cookbook.
There is forum dedicated to answering questions related to installing SQL Server in an Azure Virtual Machine.
Forums for getting help with Windows and Linux Virtual Machines are located here:
Another forum you may find useful is for Azure Virtual networks.
All these forums are monitored by Microsoft staff and most questions will be answered in 24-48 hours.
Here is a video of setting up SQL Server in Windows Azure Virtual machine.