The following is in Sony's FAQ on why they are closing their Connect online music store

Why is the store closing?
We are moving to the open Windows Media® platform in North America. In line with hat, Sony will phase out the CONNECT™ Music Service in the U.S. and Canada. Specific timing will depend on market demand, but will not be before March 2008. To be clear, the CONNECT eBook service for the Sony Reader will not be affected.

Uh what? Windows Media is open? I don't think so. It may be very much more popular than ATRAC (Sony's music format) and licensed by a lot more companies, but it isn't open.