The new rules for cash contributions relate to record keeping requirements, not document submission. From page 153 of Publication 17 (Your Federal Income Tax for Individuals: 2007):
"What's new: You cannot deduct a cash contribution, regardless of the amount, unless you keep a record of the contribution - a bank record (such as a canceled check, a bank copy of a canceled check, or a bank statement containing the name of the charity, the date, and the amount) or a written communication from the charity."
Numbers is hard
The key to understanding human behavior is realizing half the population is below average.