Index Card v4 for iOS will be available for sale on the App Store soon (Monday the 29th?) It is a "corkboard writing app" using, what else, the index card metaphor. I've been using it for several years and find it to be a light-weight outliner that's simple but seems to have a good set of features. (Alas, no folding, Bill.) The new version adds additional export options -- destinations and formats (RTF, TXT, OPML, PDF). There is also a feature to sync with Scrivener -- which I imagine will be OBE when Scrivener iOS comes to market.

http://denvog.com (site not yet updated for v4)