Bank of America offers it and so does Zecco - I'm sure many more brokers to follow. I wonder if anyone is doing it and how is it going. Not exactly a real platform for active traders - and there are limits to the number of trades. So I guess not exactly designed for the active trader in mind - but active traders are the only ones that would be interested in this so its kind of a badly designed program.
Probably 5% of brokerage accounts generate 95% of all trades - these are the accounts that care about commission costs - the active trader/investor. The other 95% that do 5% of the volume really couldn't care less.