Pasadena-based UberMedia, which develops Twitter client applications, said last night that it has updated its Echofon client for the Mac and Firefox. According to UberMedia, it has redesigned thea pplication with a new user interface for the Firefox version, including expanding lists and search functionality. On the Mac version, support for drag-and-drop of photos to Tweets, ability to send your current iTunes song, as well as other features have been added. UberMedia acquired Echofon in January.