I just finished creating a guide on my website about downgrading from iOS 5 beta 1 to iOS 4.3.3. Because I know several people were skeptical about upgrading to iOS 5, without being able to downgrade if there are too many bugs.
The way I downgraded was to download the 4.2.8 (Verizon) ipsw from any old place, Option click (on Mac) the Restore button and select the 4.2.8 ipsw that I had downloaded, and it downgraded it easily. This seems like it takes fewer steps, too. Maybe you can include it in your tutorial? I at least think it's easier, haha. And you don't have to downgrade iTunes.
One other thing us that you say the guide will show how to jb at the same time, but it ends by just saying:
"Step 3: Once you get near the very end of the restore, you will likely receive an iTunes error (1) recovery loop dialogue error. This can be disheartening to receive this over and over. Dont fret though, we have a fix, and its called RedSn0w."
You might want to explain to people what that means in case they get stuck. (Or at least provide a link to redsn0w and explain they'll need that to jb.)