Acid Rain TileMap and Camera System XNA Tutorial
Here's a tutorial on the TileMap and Camera system used by Allan Chaney in his game, Acid Rain.
Go read it on his site.
OgmoXNA
Reaching us from Matt Sams, we got word of OgmoXNA, which "includes a set of content pipeline extensions to load Ogmo Editor's project and level files, and stuffs it all into an easy to a set of objects ready to be consumed by the developer".
"What is Ogmo Editor?", you might ask! It is a "general-purpose 2D visual level editor for independent game developers".
Also, if you have little love for the Content Pipeline (shame on you then!), Matt promises that future versions of OgmoXNA will include means of bypassing it and loading levels directly from XML, if you show enough interest.
More details from Matt, here.
Article: Grid-based Isometric Renderer Tutorial
by Martin Actor
A lot of people have asked about isometric rendering, with specific attention to sorting so that things overlap properly. This tutorial will show you a method that is both fast and accurate. The approach is specifically engineered for isometric view, grid-based games. It is not well-suited to adaptation to non-grid-based movement or gameplay. With that in mind, let's cover a few core concepts.