My pal Amanda found out our county library is going to have ebooks available starting next month, which is totally awesome. (And guess who'll be donating ecopies of her books there?) We'll be linked up with the entire Marmot library system, so we should have access to lots of books. This means anybody with a library card and a computer/ebook reader/smart phone can check out books electronically, from the comfort of their home/car/office. Instantly. And no returning the book when it's due -- the digital file is no longer accessible once the check-out period has expired.
For anyone interested, the new Sony reader with wireless "Whispernet" is hooked up with Overdrive and many major library systems too, so owners can check out ebooks directly to their device.
Slowly but surely, ebooks are going mainstream.