MobileTree: This new $5 app lets you search, view and edit files on FamilySearch Family Tree from an iPhone or an iPod Touch. MobileTree has individual, family and pedigree views. Family trees you view in FamilySearch are saved in the app’s cache, so you can view them later even when you’re offline. In addition to interacting with FamilySearch, the developers also plan to expand the app into a GEDCOM viewer.
From the January 2010 Family Tree Magazine