> I have PS CS3 and windows XP.
>
> I just found an old copy of KAI'S Power Tools 3 that's never been used and
> wonder if I should discard it or install it.
>
> What do you think? Is there anything there that is good and has not been
> added to PS by Adobe over the years?
Absolutely - it's worth installing it and going through the docs, just to
pick up on some of Kai's enthusiasm.
> I'm not familiar enough with PS to determine this myself.
>
> Does it still work with newer PS?
No reason that most of the plugins shouldn't work. Let us know how it
works out.