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Somewhat dormant due to eBayization, PayPal has gotten more aggressive of late, especially in mobile, and one idea I'm very high on is the work by third party app developer, FundRazr.com on the iPhone that's become enabled by PayPal Mobile. Basically, if you're raising money for a cause, their platform allows you to promote via FaceBook, Twitter, etc. and drive donations. Now it can be done on the go with the iPhone app that just launched.
One has to wonder though how the new policy by Apple, where transactional activities of all kinds have to use the Apple In App Purchasing platform, and thus Apple takes their "bite" of the payment.
But back to FundRazr. With an app like that, startups at events where they compete against one another can become a great tool to raise money from the crowd that in attendance.