To add some levity to this:
Yes, Paypal will do what they can to protect a buyer (up to and inlcuding shutting down the seller's account). However, if the seller has already removed the money from the account (very possible considering shipping times) Paypal can do nothing for you. If the money is gone, then Paypal is helpless to get it back for you.
Just food for thought. I love paypal, and I use it for most online purchases, but you really have to understand their protection policies, and read carefully.