If your up for PDA surgery, Doctor...
Here area few tips.
If you have a 400MHz, buy a refurbished 300MHz unit
here from Computer Geeks for $140.
Sell the battery for about $30 on ebay and the power charger for about $15 bringing it to $95.00. Maybe even sell the Dell original USB cable for $10.
Hopefully someone would want the guts to the 300 MHz model for experimenting. daximx5 is right, GetHighTech may even want it. They say $45.00 for an Axim and I am sure they mean broken screen like yours... broken screens mean good mainboards.
You may even get a new screen/digitizer for about $50.00 if the stars line up right. I'd call GetHighTech 1st and see if the want the mainboard, case, button assy and chassis for $45.00. That would be the biggest cost return hurdle. I can see everything else selling pretty quick.