I just emailed myself a few PDF's to see how they worked in iBooks on my iPhone 4. I noticed something weird, and wonder if anyone else has encountered it. Once I finish downloading the pdf to my iPhone, i tap it to open, once it opens there is an "open with" button. So far so good, right? here is where it gets weird, I have the B&N reader, Stanza, eReader, Kindle, and of course iBooks apps all installed (trying to pick a favorite). when I tap the open with button in mail.app, it shows me that I can open in Stanza or iBooks, that's great, but the Stanza button has no icon, and the iBooks button has Stanzas' icon. Anyone else seen this behavior?