Two of the features I like best in Evernote are geotagging and audio Notes. Geotagging allows me to attach geographical metadata to my Notes, and the audio recording feature allows me to record audio and generate a Note with an embedded media player for that audio file. The combination of these two features makes for an easy always-handy good quality tool to capture mobile family history interviews since I never go anywhere without my iPhone.
Jon Voss of Lookback Maps has put together a fabulous video highlighting an assortment of library archive and museum mashups.
Innovative efforts by a library and a professor to teach local history through mobile location-based technologies.