Excel allows you to sort your data in many ways, but with Excel 2007 onwards we can now sort easily by the font colour or by the cell fill colour. It is easy and effective and is available as a custom sort function.
In my example below I have sorted my Sales by cell colour. My Sales column was originally conditionally formatted using the criteria to highlight all values over 5000. Then take this a step further by using the Sort By Colour function in Excel. Nice.