See Jim O'Neil's post detailing the New, Improved, No-Risk Windows Azure Trial!
The December release of Windows Azure brings many cool new features including extensive support of open source libraries. An overview of the support was announced on Port 25 on Openness Update for Windows Azure.
The Windows Azure team has announced additional savings to compute and storage customers. In addition to the SQL storage reductions announced last month, the new plan offers an Extra Small Compute at 2 cents per hour.
With these changes, a 24x7 Extra Small Compute instance with a 100MB SQL Azure DB costs less than $20 per month. The price of compute and storage continues to be consistent across all datacenters.