21. A method as recited in claim 18 , wherein the altering of the display of the one or more characters of the first input in the first manner comprises altering a font characteristic of the one or more characters of the first input within the text field.
18. A method comprising: under control of one or more computer systems configured with executable instructions, receiving, in a text field and from a user, a first input comprising one or more characters; at least partly in response to the receiving of the first input, altering display of the one or more characters of the first input in a first manner before submittal by the user of the one or more characters of the first input in the text field; receiving, in the text field and from the user, a second input comprising one or more characters; and at least partly in response to the receiving of the second input, altering display of the one or more characters of the second input before submittal by the user of the one or more characters of the second input in the text field and in a second manner that differs from the first manner.