"While Microsoft first time previewed Silverlight for Windows Mobile back in May 2007, it's neither yet available nor has Microsoft unveiled any details when it will become available. It was only confirmed by Microsoft that Silverlight for Mobile will be initially launched for Windows Mobile and S60 smartphones."
Arne Hess reports, via a twitter feed source, that Silverlight should be included in Windows Mobile 6.5. I know this will make developers who got on the Silverlight bandwagon especially happy, as they've been eager to get their Silverlight apps onto the mobile platform. Now lets just hope that the unconfirmed twitter rumors are true, and our next major version should ship with Silverlight.