I was looking for this yesterday and couldn't find it so I had to download it and try it. I downloaded Cory Doctorow's "I, Robot" from Feedbooks and it worked great. Congratulations Hadrien.
The page turns works great except there seems to be a pause when changing chapters. I assume it's calculating the page numbers? The eReader app takes a lot longer to calculate when you change font or orientation and I assume it's doing the same thing.
My biggest problem is that my finger keeps hitting the "Super Money Ball" game instead of the "Stanza" application. Must learn will power.
Now I can try reading on my iPhone 3G.
Ahemnn... without the Phone or 3G parts. [Cough]