I went nuts over the weekend and bought/dl'd several notekeeping apps. Noteshelf uses the slide up protector and it works like UPAD. Notes Plus might have it, but it's so option-laden, I'll never find it. The rest were pretty much ignorable. Honestly, it seems like Penultimate is more of a drawing app than a notekeeping app. I'm just not finding it all that useful without the slide-up protector/writing area.
That doesn't work well for me. I'd like something like the zoom bar in UPAD and some others. Would help me keep my writing neater.