Just one small refinement to what Opus 17 said. He said "in general, if you donate land to the right kind of charity, you can claim the current FMV and not the basis." That is true as long as you owned the land for more than a year. If you owned it for a year or less it is ordinary income property and your deduction is limited to the basis.
The rules for donations are complicated. That's why Publication 526 is 26 pages.
