foofight, spend some time every day to receive free BTC from different faucets, giveaways, pay-for-browsing etc. sites. After few months it will add someting to your wallet. If you believe that someday 1BTC>$1000 then I think it's worth it.
I looked into this but the cost of my computer is worth more than the just buying a coin. I image those site are loaded with viruses.