You can draw with the cricut by replacing the blade with a specially designed to fit pen which come in a variety of colours. I assume if you draw you can then replace the blade, reload the paper and cut the same image with the blade. The machine is basically a plotter with a blade as standard instead of a pen.
I don't have any pens for mine yet but I only got my cricut this Christmas. They are certainly on the list of things I would like to have though.
Have just got the demo of Sure cuts a lot (SCAL) and am certain I shall be buying that before too long. I use a Mac so will be able to create cutting files in illustrator to cut out on it. Have had a quick play so far and am pretty excited about it.