Because kuler is based on a subset of the color technology
found in the Live Color feature in Illustrator CS3, the connection
between Illustrator CS3 and kuler is a natural extension of that
shared technology. Since kuler and the kuler panel are technology
previews, it's helpful to hear from users (such as yourself) about
kuler + other Adobe applications.
I think kuler would be very useful in Fireworks as well since
it seems that that program is geared towards creating web site page
layouts and such. I think it would be a real boon for web
developers to be able to generate a color theme right in the
program quickly and easily.