Developers and designers I meet ask me one perennial question - "What's coming in 2?"
Well, some clues popping out - specially this one by Jesse Liberty.
I tend to give another piece of advice to developers/designers. Expression Blend 2 December Preview is available (and has been for a while) and designers should download it today and start working on Silverlight 1.0 sites. It gives you a good grasp of the tool and gets you setup for designing with more features when Silverlight 2 releases. You also could try your hand at WPF projects and get a hang of some WPF data-binding features as well.
Developers on the other hand should look at the coding aspects of WPF and can also get familiarized with the XAML DOM using the Silverlight 1.0 SDK. Most of the concepts of XAML and vector drawing, brushes, etc. are explained very well in the documentation and samples that come along with the SDK. Get it today and learn it inside out. If you've already done that, revisit it to see what topics you haven't familiarized yourselves with.
Other than the books Jesse Liberty put up on his post, I'd also recommend Laurence Moroney's excellent introductory book on Silverlight 1.0
If you are a new developer to Silverlight, this is one book you should get!