1. A method of facilitating the entry of text into a new message generated by a messaging application of a handheld electronic device, comprising: receiving a command to reply to or forward a received message, said received message being included within a message thread; scanning said message thread and identifying a plurality of words in said message thread; generating a plurality of word lists representing word categories including words having a particular grammatical classification by including one or more of the identified plurality of words on one of said plurality of word lists based on the grammatical classification of the one or more of the identified plurality of words; displaying said one or more word lists; receiving a selection of a selected one of said identified plurality of words from said one or more word lists; and entering said selected one of said indentified plurality of words into said new message.
2. The method according to claim 1 , wherein a first one of said word lists represents a word category including words having at least a predetermined length, and wherein said placing step comprises placing all of the identified words having at least said predetermined length on said first one of said word lists.