If you bought a Microsoft Surface or other new Windows 8 laptop/tablet with a touchscreen and stylus support, you might have noticed the screen lacks pressure sensitivity. Ideally, you should be able to draw or write on the screen lightly for faint lines, then press harder for stronger, bolder marks. The latest Wacom drivers should fix this--as long as you're using a device with a Wacom digitizer.
This list of stylus-enabled tablet PCs shows which devices use Wacom or another manufacturer for the screen. If yours is Wacom, head to http://us.wacom.com/en/support/drivers. Select Tablet PC from the first drop-down, then Windows 8, and download the latest driver. (As of this writing, that's the one released on July 30th.)
After installing the driver and rebooting, you'll have true pressure sensitivity on your tablet or laptop.