So many people have asked how I manage to scan such large pieces. And I'm astonished to know that so few people that own Photoshop do not know about this amazing, time saving little shortcut. Granted, I didn't always know about it myself, and I have a few awesome friends to thank for cluing me into it!
This particular tutorial was done using the CS3 version, but I suspect other versions of Photoshop may have it as well.
I got out my rather rusty design skills today and made this. The image used as a demonstration will likely appear in my gallery... provided my internet connection holds out.
Download for full size. Hope this helps! If you are still confused, feel free to ask.
(Yes, it looks different on a Mac. I know.