Legislation that creates new investments opportunities, coupled with cheap capital is a dangerous combination. I would not be surprised if the new JOBS Act [2] provides the spark and the Fed's loose monetary policy provides the fuel that creates a startup bubble (quickly).
Companies like Angel List [3] and Wefunder [4] have been quick to recognize this and take advantage of the new demand pockets the JOBS Act creates. Just check out their home pages.
As Sam mentions, there may be some time before it bursts, but it's very tough to figure out when it will be...and early stage company shares are not liquid.
[1] http://en.wikipedia.org/wiki/Community_Reinvestment_Act [2] http://en.wikipedia.org/wiki/JOBS_Act [3] https://angel.co/ [4] https://wefunder.com/