Offtopic: http://arstechnica.com/security/2013/04/malware-spread-on-skype-taps-victim-pcs-to-mint-bitcoins/

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Bitcoin mining is legal.

PayPal(Subscription!), Google, Liberty Reserve, Credit Card, Bitcoin

Bitcoin is legal also, at least for now, paypal and others might not like it if it keeps growing.

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bitcoin is no longer mined by cpu only, you need special rigs with inb4 video cards.

Could make a reasonable return in a short amount of time in bitcoin speculation. Could also spectacularly lose it also, but (Image)

As for Obama, unless he is posting here as @Liam who suggested Bitcoin as "the future", I wouldn't blame him (Image)

Payment via: Paypal and Bitcoin (BitPay)

The only effort involved would be buying bitcoins, and choosing when to sell. Not entirely passive by definition, but easy enough

Play the bitcoin market? In the last few weeks it's shot up from like ~$80 to ~$130 per bitcoin.

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It's "free" if your parents pay for it. I think that's how most part-time bitcoin miners earn their pocket money.

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@NickGH I'm pretty sure that the cost of electricity will be more than your bitcoin return, especially mining with a CPU.

Honestly if you have spare cpu and gpu processing power you may want to try bitcoin or litecoin mining. its slow if you have anything less than a quad-core with a dual gpu's but if you invest a little

Bitpay - 2 users so far. I have .1072 in bit coins and 5 dollars in US dollar in there. Can't withdraw with less than $25 in your account. Can have bitcoin directly converted to us dollar when purc

Only non-paypal method we offer is Bitcoin

Bitcoin too? :P