I think I need to explain what I meant by "pressure sensitive." With some pens and screens, if you press harder, you get a thicker line (or more bleed, or a different, darker color-- it depends on what the drawing software supports). These screens only work with specific pens. A common vendor is Wacom.
The alternative is a "touch sensitive" screen, which will work with any blunt instrument (including a fingernail) and will sometimes also pick up stray marks from your hand touching the screen.
I'm interested in a tablet with a pressure sensitive screen because the art programs that support it use it to make a much more naturalistic drawing/painting experience. Artrage (
http://artrage.com) is a good example of an inexpensive program that can do this without requiring a blazing processor, though it still prefers a fair amount of memory. The Gimp is a free program that needs a faster processor and more memory. Photoshop can support these pens and is quite expensive and needs a fast processor and tons of memory.
Hopefully that will help explain what I was asking about, which will in turn help anyone who wants to try to provide useful information to me (which I always appreciate!)