Originally planned for rollout during the summer, the web-based Google Bookstore will finally begin selling e-books on the web.

Do we really need another online book store?

Google's "Editions" will enter an already crowded space with Amazon, Barnes and Noble (BKS), Apple's (AAPL) iBooks, Kobo and many others later this month according to reports today.

Less than two weeks ago, Google reached a "preliminary approval settlement" with the Authors Guild, the Association of American Publishers and a handful of authors and publishers over the rights to publish books and make them searchable.  The timing is not a coincidence.

I do think Google (GOOG) does bring some differentiation and innovation to the market, which will bridge the gap between the Web and e-books.

Here are five reasons why Google's bookstore will change the ebook industry: More