I've used dr5 often over the years, and have been a great fan of the process. I had a long conversation with Dave when his press release came out, and it essentially comes down to economics and lack of demand that drove his decision to terminate the services. Some of his materials have gone up 800% in cost over the past couple of years!
Unfortunately, Dave couldn't recommend anyone here in the states who could provide direct positive b&w processing. There is a small lab in the UK, Silverpan, that advertises that service, but they totally dropped the ball in communications when I got in touch with them. And never mind the potential for X-ray damage, sending film overseas. I'm not able to do processing of any sort at home, otherwise I'd do my own direct positive processing (I have in the past, and it's pretty basic, if tedious). I've done extensive searches on the web to find an alternative lab, without success, so anyone who has suggestions for a lab that will do direct positive, please post!