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In the coming weeks and months, a dollar sign will start popping in Gmail accounts of people who already use Google Wallet, and a quick click lets users define the recipient and the amount they’d like to send along as an attachment. Since all of these transactions run through Google Wallet, the usual caveats are in place — sending funds from a connected bank account is totally gratis, but those who prefer to pay with credit or debit cards are subject to an additional 2.9 percent fee tacked on. You also need to be over 18 to take part in the funding fun, though. – Google Folds Wallet Support Into Gmail So You Can Send Money As Attachments (TechCrunch)