I've used Photoshop to design (more or less) every website I've made in the past 9 or 10 years. I hear people going on about Fireworks saying that it's excellent for web design and prototyping.
When Adobe took over Macromedia, I was surprised that Fireworks survived so there must be something great about it to keep it going alongside, for what I can see, a very similar program.
Can anybody give me a good outline of the pros and cons of using Fireworks over Photoshop and the differences I'll need to know about before trying it out?
-- edit --
I'll be more interested to hear the little things that people do with it that makes it so useful over having massive articles pasted at me.