Infinite scrolling sucks. I hate that more and more websites are implementing this terrible feature. It fails user-experience wise. I am at your website to read a particular article — don’t try to entice me with another totally unrelated one.
If you do decide to support this feature, don’t plaster it over your existing website design. That footer you have at the end? Yeah, that’s not accessible. Contact information, copyright notices, nothing can be reached. (Update: This article by Adrian Roselli details more such points).
The only publication that I feel has done this well is TechCrunch. They have thought the experience through and designed the interfaces around that.
I understand why publications want this to succeed. It leads to more page views, and hence possibly to more advertising revenue. But I was pretty surprised to see that even Dave Winer felt the need to support it on his simple blog. Completely unnecessary.
Update: Another aspect I did not think of initially was around accessibility. It must be an extreme nightmare. I think it is an issue even bandwidth wise. Especially on mobile devices. So in short, just don’t implement this solution.