Oops, I think I may have confused that with PHP... you do need 'em in there (I know this, because I had to research it a week ago for a friend asking me this exact question).
In college, my first semester of Java was 1.4.2, my second semester was 1.5, so it was a fun transition, when we had to stop using BufferedReader and start using Scanner, and our TA hadn't had java since 1.4, and thought all of our code was invalid.
i will probably update my MBP after CS3 is released, cause by mid next year im sure there will be another revision and it will be faster again, which will conicide nicely with CS3,
cause memron aint gunna make much difference to mail, safari, word, excel or web dev.