http://finance.yahoo.com/blogs/the-exchange/future-bitcoin-202631430.htmlWhen it comes to Bitcoin, the fast-growing “digital currency,” there are good ideas, bad ideas and pie-in-the-sky ideas galore. All of these were on display Thursday night when more than 300 Bitcoin investors and entrepreneurs gathered at Microsoft’s (MSFT) sleek, marble-lined offices in New York City to show off their Bitcoin-based business ideas, munch on free pizza, and ruminate on the future of virtual currency in the company of other enthusiasts.