Does the OpenStreetMap Viewer have an option to view the OSM Cycle Map?
Yes, with OpenStreetMap Viewer you can choose between three different renderings of OpenStreetMaps: ‘Mapnik’, ‘Osmarender’ and ‘Open Cycle Map’.
Does OpenStreetMap Viewer support caching?
Yes, to prevent unnecessary network load, OpenStreetMap Viewer caches map tiles. Cache size is approx. 25 Megabytes.
Does OpenStreetMap Viewer support interface rotation?
You can use Map Viewer both in portrait and in landscape mode.
The location button seems to disappear behind the task bar, why?
This is intentionally. The location button is placed immediately beneath the spot where the location sign appears in the task bar, which is available in iOS 4 and higher.