According to an
article on the Bookseller website,
"Borders will begin selling e-books on its site from April. It will sell e-books that are available from Gardners' digital warehouse, which has more than 60,000 titles. Gardners already fulfils orders of physical books on Borders' website."
This is apparently part of a deal whereby Gardners, a book wholesaler, is looking at supplying ebooks to several major booksellers. Given that The Bookseller is (I believe) a UK publication, I think this deal involves only the UK branches of Borders rather than those Stateside. But still one more step towards an increased number of outlets, and (hopefully) towards greater choice and competition.
The article also mentions that "Last month, Waterstone's hit out at the number of e-books being produced, saying that not enough were available to meet growing demand."