I second the Duel Systems Adapter. I use it all the time to copy P2 cards and I love the transfer speed and ease of use. Just make sure you leave it plugged in after inserting it, because if you remove it and try to reinsert it it won't mount and you have to restart. It is not hot swappable. It is a very cheap alternative to a p2 drive or P2store.
If I have the duel adapter for a Macbook Pro and I am transferring straight to an external drive that is connected through firewire 800, will I still get that same 8 min per 16GB card transfer speed? (Using P2CMS)
Do the RPMs on the external hard drive have anything to do with transfer rate?