WPF

• Pavan Podila - "Structuring a WPF User Interface" - Pavan shows how a UI can be factored into user controls using an example of an IM client.
• Kevin Moore - "20 steps to happiness" - Kevin shows how WPF Goodness + VS "Orcas" design-time Goodness + Linq goodness = happiness
• Satine.org - "How to build the next ultimate application platform" - He calls out GPU assisted rendering, great typesetting/layout, insanely easy animation, & the basics.  I'd argue that the basics is a lot longer than listed...
• Me - "list of Mix07 WPF Talks" - Kevin Moore's XD009 WPF for Devs Part 2 just had his video posted...check it out.
• Dwayne Need - "Multithreaded UI HostVisual" - Dwayne is a great dev lead on our team that I often go to ask "how does X work?"  Noticed on Kevin's blog that he started blogging in April.  Go encourage him to blog more...
• hawaiiantime.com - WPF Map Bird View System - Goo Labs published Xbap map viewer.  Hard to navigate extensively without Japanese knowledge...would love to see somebody's analysis if they can read the UI...
• Flash Platform! - Remix event in Milan, Italy - this blogger is impressed by Expression Blend.

Silverlight

• MarcoCantu.com - Remix07 in Milan (my take on Silverlight) - interesting read.  6 ui platforms is a bit much - i like to think of it as 3...but perhaps gadgets should be added to make 4: gadgets, asp.net/ajax, silverlight, wpf.  I leave out the fact that there are 2 versions of Silverlight (1.0 jscript only, 1.1 w/ .net support) and I don't list WinForms as most of their functionality is (or will be) supported in WPF.
• Mobilitee.org - Fat Pipe (and a little Silverlight) - discusses experience with a Yahoo Pipe and now Microsoft Popfly.