Someone suggested I ask this question here too.

On the OSM wiki, there's quite a few iOS Apps listed, but a lot of them don't focus on contributing to OSM and many of them do not seem to be in active development. Thus my question: what's the best iOS App for contributing to OSM according to you? It's for an iPad 2 with GPS. Thanks!

Link to the iOS tracking apps on the OSM wiki page:
osm.wiki/Apple_iOS#Track_making_features

Link to my question on Slashgeo (please share comments there):
http://slashgeo.org/2011/06/07/Whats-best-iOS-App-contributing-OpenStreetMap

Thanks! -- Alex