Can a cracked screen be replaced?

If you'll send it in to get it serviced, Apple will replace the whole ipod if it is repairable. Check this page for more details and pricing: Apple - Support - iPod - Service FAQ

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Out-of-Warranty Service: If your iPod requires service for any other hardware failure that is determined by Apple to be repairable, Apple will service your iPod for the Out-of-Warranty Repair Service fee.
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A word of advice pal, get a iPod Touch screen sheild.

They protect the monitor from scratches.

no like i dropped it and it shattered in a corner. it had a case and a screen protector on and i believe thats whats basically keeping it together but it works perfectly fine. i just wanna know if its worth it to bring in and see how much it is or just buy a new one