Hehe.
I'm reading Linus Torvalds 0.1 USB driver for Linux, written in -99. It's pretty easy to
follow, and has some funny comments:

/*....
* WARNING! The USB documentation is downright evil. Most of it
* is just crap, written by a committee. You're better off ignoring
* most of it, the important stuff is:
*  - the low-level protocol (fairly simple but lots of small details)
*  - working around the horridness of the rest
....*/

It can be found here: ftp://ftp.kernel.org/pub/linux/kernel/testing/old/usb/
It's not exactly fun to translate from C -> asm, but atleast his first source version isn't [i]that[/i] big..
usb.c and usb.h each 9kb, uhci.h 5kb, uhci.c 19kb and a driver for usb mouse about 2kb

That and a quick look on the docs may help me understand it better. I think it helps to write stuff down as
you read it, so that you'll have a nice overview written by yourself, for yourself. Now it's time for me
to do those 2 hours of coding I promised myself..

Hows it going with your other projects?