I noticed something lacking the the dictionary when u are using handwriting to input text. the dictionary only tries to guess the word one letter ahead.

I have used a other PDA's before and they allow you to customize how many letters ahead you want the dictionary to guess.
to overcome the problem in the e680 you can add quick text to unique words and the dictionary will spell out the remaining words. eg. i added the word 'jurong' in the quick text. After typing 'ju' in the input text, it spells out the word 'jurong'

BUT~~~ it seems to work on more unique words only. And only if the words are at least 4 letters long.
After adding the word in quick text for the first time you can delete it. The dictionary seems to remember the word for life.

OR~~~~ is there anyway to edit the in built dictionary itself? i prefer using a T9 dictionary, faster and you can type text while you are walking