If you haven’t had a chance to check out the sessions from MIX10 that showcased Expression Blend 4, the links below should help you out:

Authoring for Windows Phone, Silverlight 4 and WPF 4 with Expression Blend
by Christian Schormann and Pete Blois

Dynamic Layout and Transitions for Microsoft Silverlight 4 with Microsoft Expression Blend
by Kenny Young

Prototyping Rich Microsoft Silverlight Applications with Expression SketchFlow
by Chris Bernard

This post only focuses on the sessions from MIX that are Expression Blend specific. By now, all of the sessions from MIX should be available online, so head over to the MIX Sessions page to view more: http://live.visitmix.com/Sessions

Cheers,
Kirupa =)