Not only is checking laptops a bad idea for MANY reasons (most already stated) it does indeed go against Delta's guidelines.

From their website http://www.delta.com/traveling_check...alue/index.jsp

"Delta is not responsible or liable for cash, camera equipment, commercial effects, computer software and equipment, electronic equipment, fragile articles, jewelry, lifesaving medication, negotiable papers, irreplaceable business documents, works of art or other similar valuable items contained in checked or unchecked baggage. These items should be carried by the passenger."