29. A portable electronic device, comprising: one or more processors; a touch screen display; and computer readable memory comprising instructions that, when executed by the one or more processors, perform operations comprising: receiving a plurality of user character inputs through the touch screen display of the portable electronic device, wherein the user character inputs are received through a virtual keyboard displayed on the touch screen, wherein the virtual keyboard simultaneously displays a first plurality of virtual keys each associated with a respective single letter of the alphabet, and a second plurality of virtual punctuation mark keys; displaying on the touch display a current character string as input by a user; while displaying the current character string, also displaying a suggested replacement character string for the current character string, wherein at the time a suggested replacement character string is displayed, the portable electronic device is able to receive a plurality of possible user single touch inputs that will result in selection of the suggested replacement character string, and wherein said plurality of possible user single touch inputs includes actuation of one of the plurality of virtual punctuation mark keys; receiving a single touch user selection input through one of the plurality of the virtual punctuation mark keys; and in response to the single touch user selection input, replacing the current character set with the suggested replacement character set and adding at the end of said character set a punctuation mark corresponding to the virtual punctuation mark key through which the input was received.
29. A portable electronic device, comprising: one or more processors; a touch screen display; and computer readable memory comprising instructions that, when executed by the one or more processors, perform operations comprising: receiving a plurality of user character inputs through the touch screen display of the portable electronic device, wherein the user character inputs are received through a virtual keyboard displayed on the touch screen, wherein the virtual keyboard simultaneously displays a first plurality of virtual keys each associated with a respective single letter of the alphabet, and a second plurality of virtual punctuation mark keys; displaying on the touch display a current character string as input by a user; while displaying the current character string, also displaying a suggested replacement character string for the current character string, wherein at the time a suggested replacement character string is displayed, the portable electronic device is able to receive a plurality of possible user single touch inputs that will result in selection of the suggested replacement character string, and wherein said plurality of possible user single touch inputs includes actuation of one of the plurality of virtual punctuation mark keys; receiving a single touch user selection input through one of the plurality of the virtual punctuation mark keys; and in response to the single touch user selection input, replacing the current character set with the suggested replacement character set and adding at the end of said character set a punctuation mark corresponding to the virtual punctuation mark key through which the input was received. 30. The device of claim 29 , wherein the plurality of possible single touch user inputs that will result in selection of the suggested replacement character string includes inputs that are not associated with a virtual punctuation mark key.