During the time we have to wait for the new MS Expression Blend toolkit, some exciting demo videos present the capabilities this new user interface engineering tool will provide.

I have found the following videos on YouTube after reading through some news on the web:

• http://www.youtube.com/watch?v=zsAZjb7FKXA
• http://www.youtube.com/watch?v=f3ErrS68YMM&feature=related

The UI prototyping support looks more and more amazing. I assume the sketching functionality will start get become even more exciting by using some multi-touch or pen input devices.