I decided to post a couple of very useful links to resources on Windows Azure, which I happen to use very often and almost always search for them first.
So here there are:
Register on Microsoft Connect to get CTP account (limited)
Note: it is one registration process for both Windows Azure and SQL Azure. However the invitation tokens does not come together and you have to be patient, you will recieve both tokens in couple of business days.
Windows Azure Platform on MSDN
Tools & SDKs
Windows Azure Tools for Visual Studio (NOV'2009)
Windows Azure SDK (NOV'2009)
Microsoft .NET Services SDK (NOV'CTP)