I can confirm that the report above is accurate. Diamond has halted shipments to Borders. As I understand it a lot of the big New York publishers (or, rather, their lawyers and accountants) were in a series of meetings with Borders management today that will likely decide the fate of the company. I'd pay a lot of attention to Publisher's Weekly tomorrow for any fallout of that meeting.
As the issue (in this case) is primarily between Diamond and Borders, Diamond made its own decisions about how to proceed. I am hopeful that a solution can be found that satisfies Borders, distributors, and publishers, but this is not a surprise to anyone in any part of the publishing industry, and folks have been planning accordingly for a while. There have been rumors about a Borders collapse being imminent for at least 2-3 years, at this point.
I'm not saying that it's going to be easy for publishers and distributors if Borders goes under, but we have looked at our finances and our exposure and we're confident that even in the worst-case scenario we will be able to weather that storm.
--Erik