13. A speech recognition system accessible over a network, comprising: a first speech model; at least one processor programmed to implement a speech recognition engine capable of recognizing speech data based, at least in part, on the first speech model; and a speech model controller to; receive, from a user device of a user, the user device comprising a personal speech model trained for the user through previous speech recognition operations, one or more personal speech model components of the personal speech model trained for the user through previous speech recognition operations, the one or more personal speech model components describing personal voice characteristics of the user; update the first speech model using at least some of the one or more personal speech model components, by modifying at least one speech model component of the first speech model and/or adding at least one speech model component to the first speech model; and transmit user speech to be recognized by the speech recognition engine using the first speech model updated with the at least some of the one or more personal speech model components.
13. A speech recognition system accessible over a network, comprising: a first speech model; at least one processor programmed to implement a speech recognition engine capable of recognizing speech data based, at least in part, on the first speech model; and a speech model controller to; receive, from a user device of a user, the user device comprising a personal speech model trained for the user through previous speech recognition operations, one or more personal speech model components of the personal speech model trained for the user through previous speech recognition operations, the one or more personal speech model components describing personal voice characteristics of the user; update the first speech model using at least some of the one or more personal speech model components, by modifying at least one speech model component of the first speech model and/or adding at least one speech model component to the first speech model; and transmit user speech to be recognized by the speech recognition engine using the first speech model updated with the at least some of the one or more personal speech model components. 18. The speech recognition system of claim 13 , wherein the personal speech model components are personal acoustic model components.