the author of this app says:
TextPlus is a system enhancement that can significantly improve the speed and accuracy of text entry on your handheld.
TextPlus supports intelligent, dictionary-based suggestions for words and phrases to speed up your text entry.
When you enter one or more letters of a word or a phrase in TextPlus, a list of words and phrases that start with those letters is displayed.
When you tap on the words or phrases, your choice is automatically inserted at the current cursor location.