When I attended Remix last month I made some notes in the evening on what I learned that day:
Top Line:
The Silverlight site has some great videos on what's new in Silverlight 3.0
Azure:
Such as taking the data from a SQL Server database and upload it in their Azure table storage account
Silverlight 3:
Blend 3:
Keynote:
Other:
Sketchflow (experiment with ideas for dynamic user interaction)