The method i used back when I actually salvaged skids was as follows:
Place the pallet flat on teh floor.
Slide a piece of Something under it, holding it off the floor by 3" (+/-) making sure that the something is not under the last board in the pallet.
Using a 3 lb hammer knock the board down into the floor and watch it pop free.
Slide the piece of something back one board and repeat until all boards have been freed on one end.
Move the piece of something hard to the other end of the pallet and repeat.
If there is a middle rib in the pallet, move the piece of something next to the middle rib and repeat.
You may have to flip the pallet and do both sides at once. Usually the more boards there are on teh pallet, the better tehy will pop free. As the boards come away, the pallet will lose its strength adn flex with teh hits, reducing the pop-ability of the boards. The last board is often the worst.
Good luck, and be safe. Those nails can hurt!