Silverlight Streaming has had an update pushed out. You can read the details but the summary is

• a new invocation method: link to an HTA package of your Silverlight app.
• performance improvement for the accounts that use a large number of file sets
• more liberal naming convention for applications (the better to use internationally, my dear)
• some bug fixes

I may test out the perf changes. I have a Deep Zoom app which is a 40x40 tileset. I just need enough bandwidth to actually upload it!