I found a great replacement for PayPal the other day that lets you send money without having to charge a 3% fee for the transfer or having to call something a gift when it isn't. It's called Square Cash and it's from the same company that makes the little iPhone/iPad credit card readers that you see at food trucks, farmers markets, etc. It uses e-mail for the transaction and uses the sender's and receiver's debit cards to transfer the money. I used it the other day to tip the guy who steam cleaned my truck when I forgot to bring cash.
The app is in the App Store or you can do it over the web: