The pricing for Windows Azure Content Delivery Network (CDN) was announced last week. The prices are:
CDN rates are effective for all billing periods that begin subsequent to June 30, 2010. All usage for billing periods beginning prior to July 1, 2010 will not be charged.
To help you determine which pricing plan best suits your needs, please review the comparison table, which includes the CDN information.
Steven Nagy has also done an interesting follow up post on CDN.