A powerful window/object editor to be used at runtime that allows viewing/changing of properties and fields, method invocations, and object hierarchy navigation.

Nice class that makes your top-level forms stick when moved or resized. Makes it easy to arrange the windows on the desktop.

Another macro to show an RSS feed in VS.NET, nicely formatted using the CP colors

Observer Pattern implemented in a nice template model, easy to use as it does not require the classical inheritance and can easly decouple Subject and Observer.