It seems that some of the problems of earlier versions have been solved, and this has become a solid product. There is one missing piece, and thats a convenient way to get presentations from Keynote on the iPad to Conference Pad. Keynote unfortunately doesnt allow one to save PDFs out to other apps on the iPad; the fault is Apples but unfortunately it affects the usability of this product so Ive given it 4 rather than 5 stars.
Fortunately, theres an easy workaround: From Keynote on the iPad, choose Email Presentation, and choose the PDF format. Send the email to yourself, then open the email when it arrives and tap on the enclosed PDF. Choose Open With...Conference Pad.
This is a lot to ask from one app, but it would be great to be able to annotate a presentation, too!
Update (March 2012): This is still a good app, but updates are rather few and far between, and its still too difficult to get PDFs into the app. Conference no longer seems to be able to identify itself to iOS as an app that can handle PDFs, so the Mail workaround above no longer works. That means that going through iTunes or using the Conference Pad Loader app are the only ways to go; unfortunately, neither way is really viable in situations where iPads are shared. Heres hoping that the Open With… functionality is restored soon.