Overstock may be a first mover in terms of major company offering cryptocurrency(s).
However the company is not growing that much, jigged its revenue somehow (not looking too indepthly) December 2013 earnings $400 million revenue $75 million profit when normally it makes $330 revenue per quarter with $1 - $3 million profit. (Normal margins in retail even online retail, look at Amazon 0.50% margin.)
Dont take in consideration to much about Overstock only a small amount of their users use bitcoin as their payment option. (Remember most people got into bitcoin on speculation, its only now that they are probably starting to spend small amounts).
They do have zero long term debt but their cash/accounts payable is how they are running their business whereas their accounts receivable is only 6 - 8% their cash and 10% their accounts payable.
Interesting company....
***Addition***
Notice that if they were getting many users from bitcoin they would have already understand the "slow transacton times" that bitcoin has. (Unless your using an exchange and boom look at mtgox).
They (Overstock) is playing this cryptocurrency game half ass otherwise the small amount of transactions they got they would have been ahead of us as did not they announce they would use bitcoin last a year and some ago.