Another thing that the 350 has over the 300 is the built in dictionaries. (Analogus touched on this--mentioning the ability to translate.) I have a 650 and absolutlely love the dictionary feature--you can just double tap on a word and presto--at the bottom of the screen a small window pops up with the definition. You can open this up the dictionary into full screen mode for a more in depth view of the dictionary. I find myself looking up words that I'm pretty sure I know the meaning of, and every once in a while I'm surprised by the actual definition.
dordale