If you can find it a VGA heatsink and cooler or maybe a setup from a laptop may work.
Or mod a skived fin Socket462 heatsink.
Now Galileo is real. Muhahahahaha :p
yeah, I'd recommend a laptop heatsink.
Mounting would be the problem with that.
If you decide thats what you want to do though I can look through some for you, as I understand its not easy for most people to go through laptop model numbers and know if theyre socket P or not off the top of their head :P
Even though this is a bit late, consider the Nexus PSM5000 or PSM-2500 series for socket-P cooling.
I use the PSM-5000, with very little airflow over it, it does an admirable job.