I can't believe PayPal still exists.
Anyway, I'll clarify a bit. PayPal does not automatically deduct from your bank account when you send money, you have to actually withdraw money from your bank account, which takes a few days. So if you intend to win an auction and pay with PayPal, make sure you already have money in there or the seller may get angry.
That said, watch out. PayPal will do everything possible not to help you if you are stuck dealing with a scammer. I speak from experience, having lost $250 and an item thanks to PayPal/Ebay's great protection policies.
Of course, I still use PayPal and Ebay, because really, what else am I going to do?
Edit: Oh, and if you're not aware of the SA story mentioned above, it's likely the ONLY reason PayPal actually responded to their queries is because it received a truckload of negative press via /., Fark, and the like. So if you have a problem, don't expect help