Silverlight and WPF development would be so much more fun (it's pretty fun already) if I could do any kind of cool design work on the UI.  I have finished scaffolding out all of the stuff I want to do to get SlickthoughtTV up and running (access in one place to all of my screencasts) and by extension for DeveloperMinute.Com (coming soon).  But I absolutely suck at doing cool graphic design for UX.  I have some neat ideas, but I just cannot execute them worth a damn.  Not sure how you build those skills since I think a fair amount of it is just "artistic sense".  I'm sure I am a bit limited in my muddling around with tools like Expression Blend and Expression Design, but even if I was a master at those tools I wonder if I could still get colors, shading, etc. correct.  Maybe, but I am not convinced.