My first walkthrough was Going Commando. It's a pretty cool game, it was requested first. But it did take my a while in between parts, mostly because I kept pausing the Walkthrough to do guides to keep people's interest up. I thought that it was a good idea.
The Walkthrough was a success, it was also kind of long. I mostly covered all of the basics to the game, as well as all of the weapons and gadgets. My favorite level in the walkthrough was probably one of middle levels, like Tadono.