I should also add the the product I've used on completely dried out saddles is the horse tack treatment Ko-Cho-Line:
http://www.beval.com/Products/Ko-Cho-Line/5031001.aspx
It smells awful, but a layer slathered on the bottom of a dried out saddle, then leave the saddle in a big in a warm place until it absorbs, really works well.
Neal