Jason Nadal posted a description of the DataTransformer. A DataTransformer is a handy way to transform data-bound data into another format, like a number into a formatted string or a string into a background color. Make sure to download the B sample, which shows things a little more completely.
If you haven't gotten the Indigo bug yet, Benjamin Mitchell lays out a nice, easily digestible Indigo intro on what all the fuss is about. I especially like the picture showing all communications roads leading to Indigo while maintaining the advantages of multiple styles of programming. Looking forward to reading more, Mr. Mitchell.
Adam Kinney is at it again, this time with a sample RSS Aggregator that uses Avalon's adaptive flow layout and some WinFS. Things are starting to get interesting...
If you don't already know the basics of .NET's Code Access Security model, you shouldn’t wait any longer. Not only is CAS key to No-Touch Deployment today, but it's key to ClickOnce deployment in Whidbey, which will also be a huge part of the Longhorn deployment story tomorrow (or maybe the day after tomorrow : ).
Kenny Lim posted an article about Visual Trees in Avalon that was down right inspirational. In fact, I spent all morning building a little app that will dump the <VisualTree> portion of a <Style> so that when you're customizing the visual tree of an existing control, you have some place from which to start. As soon as I figure out how to get property aliasing and data binding info at run-time, I'll post my app for real but the current version is available here for the adventurous.