Jason is looking for a tablet that he can do sketching with. Or a device that he can hook up to a computer. Leo says that everyone uses Wacomb, especially the Syntique - which is a bit pricey. But the Intuos is a nice model as well. Wacomb is definitely the way to go. Get the largest you can afford. And make sure you have pressure sensitivity so that the line will get thicker or thinner depending on how hard you press. That's one of the fallbacks with sketching on an iPad, for instance, there is no pressure sensitivity.
Ed's daughter loves to draw, and he got her a Wacom Bamboo tablet to do it digitally. She's even animated her drawings with Movie Maker. There are several options that would be much better suited for this, however: