Isn't Illustrator the program from Adobe that's supposed to be for drawing and stuff and Photoshop just for touching up photos?
That's not really true. The difference between Photoshop and Illustrator is that Photoshop is what's called a raster program and Illustrator is a vector program. To put it basically, in Photoshop you are working with images on a pixel-by-pixel basis, but in Illustrator you are putting together images based on graph co-ordinates and lines and shapes (not that you're working on a graph or anything).
They're both useful for different things; Personally, I almost never make anything that hasn't used a lot of both. Most people that I know who color ink drawings tend to use Photoshop. If you wanted really elegant, smooth shapes of color, though, Illustrator might be a better choice. It all depends on what you want to do.
One thing that Illustrator will never have that rules the earth, though:
DODGE AND BURN TOOL. Rock and roll!!!