I just started realizing I have like 15 cards in my wallet...very annoying, and I wanted to get them in my phone so I didn't have the added thickness... I have found people recommend cardstar and keyring...whats the difference or is it just preference? Also, passbook seems like it could make these obsolete, but it requires you to wait for an official app, or use passsource.com, which seems fine, but doesn't guarantee safety of the information you provide, right in the TOS. Granted, my rewards cards aren't credit cards, and don't require Fort Knox safety, but its still good to know, regardless. Just wondering what you all thought on this subject...what to you, which app, and why?