There is a program like the one you describe, called "Snowflakes". I pulled up a news article on Nexis, which says that between the founding of the Snowflakes program in 1997 and January of 2006, they had "placed" 99 embryos.
99. There are estimated to be about 400,000 excess embryos out there right now. I suggest a supply/demand imbalance.
Interesting. Like I said, identifying the problem is only half the battle. Maybe only a 1/4.