I am not usually to dispense stock tips, but I think A123Systems is a company to watch. They are going to IPO soon.
A123Systems is targeting three primary markets with its Li-ion technology: transportation, electric grid services (EGS), and portable power.I think batteries are going to see big growth in the transportation market and A123 has some of the best technology out there. If they can continue to execute this company can go far.
On the light-duty transportation front, in addition to its work with GM and a supply agreement with Think Global to provide battery systems for the TH!NK city EV, the company has development work underway with a number of other partners.
via Green Car Congress