Im personally a fan of Fireworks, espeically now that it is integeral in the the CS range of adobe products.

Mainly as it is graphics wise, what dreamweaver is for the inexperienced webdeveloper. It has many of the functions of photoshop but is less intensive and far easier to use for smaller tasks.

However for image creation (logo's etc) ilistrator and for image optimization photoshop (and animation in the case of .gif's due to known errors with flash exporting in this format) and with the CS range its easy to switch between any of the packages.