AppleInsider (link, link) has published screen shots of various components of OS X Tiger builds showing previously undocumented features. Among them are support for Jabber accounts in iChat, broadened parental controls for family members with Family Controls, RSS reader preferences for within Safari, Address Book sharing, PDF bookmarking, and incremental Energy Saver settings, Dynamic DNS sharing preferences, an iTunes album art screensaver, and an option to encrypt memory when being swapped to disk. Among several other noticeable additions, the new Tiger builds reveal a brand new Mac OS X Graphing Calculator application, iCal calendar groups, and an enhanced dialog that provides bug report and safe relaunch options following an unexpected application crash, according to AppleInsider.
While not technically a rumor since these are coming from developer builds, the screen shots show a glimpse of the direction Tiger is taking, and show the relative refinement of the operating system at this stage of development.