I normally stack my splits on pallets, with at least 2' of space between rows and between each pallet in a row. I can easily walk through the stacks. Unfortunately, 6 cord of mainly oak that I stacked about 2.5 years ago were stacked on pallets, but with essentially no space between pallets - the stack is essentially a 7'X30' rectangle. I had considered restacking for a long time, but since I knew it would have 4 years to season, I didn't bother. Big mistake. A section fell over yesterday while I was collecting and burning downed wood from Irene. I was able to get toward the center of the stack, and man that oak was still heavy. Threw a couple rounds and splits into the fire pit to see how the burned, and water was pouring out of the ends for a LONG time - no where near seasoned. So.......I plan to fill my barn early with the five cord that is very well seasoned, and then restack the wet 6 cord of oak. I just hope that this oak is ready for winter of 2012/2013, but I have my doubts. Fortunately, I have an additional 9 cord or so of oak/maple/beech/ash that will be 3 years in the stack as of next winter - I'll pull from that if I need to. Geesh, I wish I would have listened to myself and restacked the tightly packed oak 2 years ago. It just couldn't get any wind or breathe well. Learned a good lesson. Cheers!