I was asked to borrow an e-book via inter library loan for a customer. I realised that this was something that we would probably not be able to do for the customer. Unfortunately borrowing an e-book is much more complicated that borrowing a print version - when in theory, it should be fairly simple...
I found this post quite usful in explaining some of the problems around interloaning e-books:
http://www.swets.com/blog/interlibrary-loans-in-an-ebook-world