In a gold rush it’s the people selling pickaxes that get rich and with bitcoins the greatest profits are to be made by companies who solve problems for bitcoin users and add value with bitcoin services.
Seedcoin is a Bitcoin startup incubator that has a basket of 7 very promising bitcoin related startups you can invest in with even small amounts of bitcoins and effectively become part owner of at Havelock Investments. I did and it feels awesome.
That's not "how to invest in bitcoin startups". That's "how to parlay your possession of a measly amount of btc and your unwillingness to think and research into a warm and fuzzy feeling".