I have a Wacom Intuos 6x9, and I love it. It is wierd to draw in your lap, or prooped against the desk while your eyes are glued to the screen... and then you wonder why your pen isns't working because you picked up the wrong one with out even looking down!!
I did these two pictures with in 2 days of getting my tablet (don't be too harsh), and i could never have done it with a mouse in the 3 or 4 minutes that each actually took.
//edit: I just posted these pics to the gallery, so you might have seen them already.
A Skexis, like from the dark Crystal
http://i2.photobucket.com/albums/y37/Xsavi0r/skexie.jpg
A Disco Alien, because that's what the random shapes suggested to me
http://i2.photobucket.com/albums/y37/Xsavi0r/disco.jpg