I have all my fonts in two different sorting schemes. The first and most used is alphabetically by style. The second is alphabetically by manufacturer. This allows me to browse my fonts quickly no matter how I am looking for it.
I can, for example, look at all my script fonts in one showing or I can look at all the fonts I have from any given manufacturer in one showing. I use a font manager named TypoGraf which can handle viewing, installing and moving to a different directory (how I got them sorted in the first place).