James Fee reviews iExtMap, a mobile GIS viewer for the iPhone and iPod touch (it’ll work on an iPad, but not natively). iTunes link. Despite some issues, “I think there is a ton to like about iExtMap,” says James. “Out of the box you have OGC support (KML and WMS) which I really think is critically important. Support for ArcGIS.com (ArcGIS Online) layers is there as well so you have an iOS app that can work across OGC and proprietary services.”