using touch screen monitor in 7 you can swipe up from outside of bottom edge and unhide your auto hidden Taskbar.
using touch screen monitor in 8 you can swipe up from outside, poke, prod and pray... and once in awhile you might get lucky and get the taskbar to rise.
At first I thought it was my new monitor, that I bought because my previous one was 'not 8 certified and would work, but not as good as one that is certified with windows 8' according to 7 to 8 compatibility check. Then I booted back into my 7 disc and lo and behold, swiping up works just fine.
Way to go MS, keep improving things each iteration like this and we'll be back to slate and chisel... or punch cards.