The link below is to an article that looks at Ebook Plus, which provides ebooks for free supported by advertisements.
The link below is to an article (with photos) featuring the first advertisements for famous books.
The link below is to an article (with photos) featuring a number of vintage advertisements for reading and libraries.
Advertisements on the Kindle was not a smart move by Amazon, but they have quickly responded by allowing owners to opt out of the advertisements for a one off fee. That was a very smart move and has prevented Amazon loosing their place as the top dog in ebook readers and sales. This could have been the decision that destroyed Amazon and may have allowed another player to gain ground easily on them. The link below is to an article that reports on the opt out opportunity.