Just trying to look for the dictionary to delete words (cos even though I know you can't, that's madness) and I discovered something I didn't know...
Did you know you can move the position of the little suggestion box by long pressing on it? Quite handy really, I always found the default position got in the way slightly of the send button. Not any more!
Edit... actually not so hot, it went back to the default position next time I unlocked the phone. Bummer.