The amount of cash they offered for the company was substantial, and their only real hurdle in getting this accomplished was the FTC. After a relatively short investigation, the FTC has given approval of the deal as of today. Now it'll only be a matter of time before Napster becomes retail-chain owned.
Somehow I don't see how this will make the service any more appealing than it is now, or what advantage it would give them over other online music services. Best Buy must be awfully confident.