The other theme was so hacked up it was driving me nuts. This one supports the latest features of WordPress 2.0 so it should be easier to handle. Plus I wanted something a little wider than the 768px width of the old theme.
Oh and yes that old blog header was from ArcGIS Explorer so if you remember what it looked like you can see San Francisco. 😉 I got rid of it because I wanted something more simple and nothing is more simple than text on a background color.