I've found this bug using the application Notes of my N70:
When using the character "carriage return" (the one that makes the cursor go to the next line) in Dictionary mode and then quickly pressing the RIGHT direction on the controller (as when you are writing a word with two letter that have to be written with the same button), the application quit.
Ie: writing "more" you click 6,RIGHT,6,7,3.
if you write 5,4,0,0,RIGHT
the application instantly quits.
I think this Is a bug,i didn't know if theres somewhere more appropriate than this forum to signal it.
In this case someone tell me!