A great quick tip, from the excellent design blog BittBox, to create a color group of all the colors in an Illustrator document: Select all the art in your document, go to the Swatches fly-out menu and choose “New color group” – you now have a color group folder of all the colors in the artwork. Very cool!

Since color groups are a CS3 feature, this tip is Illustrator CS3 only.

via BittBox