eek! I guess I'll echo what everyone is buzzing about: Silverlight 2 Beta2 is ready for you. As always, ScottGu follows the announcement with an in depth post on the feature set. Worth reviewing.
Things to keep in mind:
"Silverlight 2 Beta2 will not run applications that target Silverlight 2 Beta1."
What I'm following? The Networking Improvements: Cross Domain Sockets, Server Push, WCF, REST and JSON capabilities. Nice work!