This approach, also known as progressive enhancement, is SEO-friendly and offers your users a better user-experience, resulting in longer visitor times and more page views.
Back-button proof: The browser url is automatically updated when you scroll between pages. Users can reload or bookmark the page and always return to the right page.
Highly customizable: With it's flexible API and event based architecture you can adapt it to your needs.
Infinite Ajax Scroll is an open-source project and can be used in projects under the AGPL license. The AGPL license requires that your project(s) should also be licensed (and open sourced) under AGPL. For closed-source/proprietary projects you can buy a Commercial License to remove this limitation.
After purchase you will receive a Commercial License PDF which grants the right to use Infinite Ajax Scroll in your commercial projects.