1. A handheld computing device, comprising: a user interface; a digital data processor coupled to the user interface and programmed to perform operations comprising: over time, monitoring and recording cues describing the device environment and monitoring and recording user performed actions of configuring the device and operating its application programs; learning which if any of the recorded cues and combinations of recorded cues are relevant predictors of which of the recorded user actions; for each user action having a learned relevant predictor, planning one or more of the following types of machine-executed actions: configuring the device to streamline user performance of the user action; causing the device to perform the user action; responsive to occurrence of learned relevant predictors of user actions, performing the machine-executed actions planned for the learned relevant predictors that occurred; the operations further comprising prioritizing interpretation of inherently ambiguous user-entered text input by favoring a disambiguated interpretation consistent with the present environment of the device, where the present environment of the device includes detected geographic location and the prioritizing operation comprises planning a disambiguation operation comprising favoring interpretations of user-entered text input consistent with said geographic location.