freelancer2227 AKA: Jon Harris, Product Manager for Expression Blend and SketchFlow.
Motto for the day: If you're creating WP7, SL or WPF apps and you're not using Blend - you should be!
Get up to speed fast with the 5 day onramp training series
or for WP7 specifically check out .Toolbox
and right at the bottom of the page you will find 4 WP7/Blend specific training courses in the extra credit section - enjoy!