The colophon is the place where you write about the technical aspects of your creation. If it were a book, you'd talk about the typeface in which it was set, the printing process, the binding, the cover, etc.
For a blog, well, the expectations may be much the same, but the details can be very different. Take the typeface, for example. On a web page, the best a designer can do is suggest to the user what typeface (font) should be used to display the text on the page. What actually is presented is mostly uncontrollable.
Theme
Giving up on my previous theme, I am now using the new default theme for WordPress 3.0, called Twenty Ten. It is simple, pretty, feature-full. Just exactly what I have enough time for.