If you still have a picture, but you see cracks, you can likely change just the digitizer and have it working again. If you have no picture ... you have more issues. The L.C.D. and digitizer are separate parts and can be bought separately. The L.C.D. typically runs double the price of the digitizer (for M001 and M002).
You can buy parts for the Apad (M001) from dealers in China but if they decide to send you junk or even defective stuff ... you really have no legal recourse. Not to mention, it takes a good week for delivery and shipping for one of these are about 18,50 U.S. .
Buy it from the U.S
You can buy the digitizer for the M001/M002 from the U.S. , here http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260708887951&ssPageName=STRK:MESELX:IT
Be very careful if you do the repair yourself. Some of the parts (Including the digitizer) are very fragile.
Search Youtube and alike for vids on doing the repair, your less likely to cause yourself more heart ache that way.
Good luck, Shawn