Jilly,
Ya can't go wrong with open air stacking (can loosely cover with a tarp - I like to say it adds to the seasoning or aging process. Burning 'green'/fresh wood is smoky & causes byproduct built up (called creosote) in the chimney stacks (if a fireplace or wood stove are used).
Placing directly on the ground can lead to moisture & rotting of the lower level. Sometimes you may just decide to sacrifice some of the wood to elevate the stack. I've used wooden pallets (obtained for free at local stores) to get the benefit from every log. (Side Note: I use pallets with stored items in the basement to minimize moisture & water damage.)
I caution anyone in stacking next to the house due to termite nesting & infestation, or any other damaging pests/rodents.
A simple internet search at 'Wood Stacks' yielded a number of sites (articles from Popular Mechanic and Mother Earth News are there with YouTube videos)
Last edited by Beetlemess; 03/06/12 02:40 PM.