Just a few days ago, a librarian told me through the Ask a Librarian service that I cannot download ebooks onto my Nook. I'm just wondering whether the library plans to acquire ebooks that are compatible with ereaders in the near future.
Probably not "in the near future:" most of our e-books are licensed from publishers (or in some cases, third-party vendors) who have constructed a special e-book interface. Sometimes downloading into PDF is permitted, but most of the time you have to read the book via the vendor's interface.
Given the variety of computing hardware we see being used in the Library, we prefer e-books that can be used on a variety of different hardware platforms. Making our patrons go to a publisher website may not be ideal, but is better than requiring patrons to have a specific e-book reader or us having to purchase a e-book in multiple versions (Kindle, Nook, iPad, etc).
Further, we're a little concerned that buying actual files would leave us in proprietary formats that could go obsolete quickly. (We've had several bad experiences with CD-ROMs that are unusable now because they require programs that have disappeared.) By purchasing access via a website, we put this burden on the vendor to keep their files up to date.
Now, taking up the Suggestions Office crystal ball -- we could see the industry standardizing on one file format (EPUB, maybe?) and (if our vendors offered it) the Library purchasing downloadable EPUB books. Another scenario would be if the University made a commitment to supporting a specific model of laptop/reader -- if every student got an iPad, for example -- which might cause us to look at buying downloadable e-books compatible with that device.
Until then, however, we're probably going to stick with the current model of going to a vendor/publisher website and reading the book at that site. This isn't as elegant a reading experience as on the Nook or Kindle, but has the advantage of being accessible from almost any computer on- or off-campus.