I don't know much but I do know GE is making charging units, I have seen them in some advertisements.
It is a great opportunity but most likely gas stations will turn into quick charge stations. Also, I could see charging stations at parking garages etc.
The money is probably in creating a company that will install them and cut a deal with the garages. Probably start small with a few spaces in a bunch of garages within the next 2 years and then expand as electric cars take off.
The question is, are there businesses out there planning to do this now?
What do the garages have in mind on their own?
What are the gas stations planning on doing?
How do you procure the charging stations and then build a billable business around it?
How much does a station cost?
What is a reasonable amount to charge for usage while you can still make a profit?
How do you get a garage to allow you to install them since it would be on their property?
Like I said, great idea but there are a lot of things to think about. I am sure there is a ton more than this list. Get a solid business plan and some seed money and I bet you could make it happen.