This video shows off 2 scripts that I use quite often.
"Delete Fluff" removes all the extra color swatches, symbols and styles to reduce file size.
"Render Swatch Legend" creates colors swatches on the artboard that have been used in the artwork in the entire file.

Here are links to the files.
Delete Fluff: http://bit.ly/delete_fluff_script
Render Swatch Legend: http://bit.ly/RenderSwatchLegend