In getting to know Prototype a little better, I decided to go through the latest version of the Prototype library (1.5.0_pre0) and detail every method and property that was available. In doing so, I got a much better understanding of how the code works. Here are the files in a 1280×960 and a widescreen 1440×900 version.
There are two different versions - one on white and another on a black/gray fade. The 1280×960px sizes are about 123kb and the 1440×900px sized are about 125kb.
Prototype Dissected - snook.ca