I know using a pre-ferment is good for making a quick dough, but is there any other advantage to using a pre-ferment?
If I take my 3-day dough recipe and use some of the flour and water to make a preferment first, then continue the recipe as normal for 3 days refrigerated, will there be better flavor?
Yes. You can read all about it at
http://web.archive.org/web/20040814193817/cafemeetingplace.com/archives/food3_apr2004.htm. Another version of that article also appears at
http://www.bakerconnection.com/artisanbaker/article_04.htm.
I also showed an example of how to use a preferment (sponge) for a cold fermentation application at Reply 28 at
http://www.pizzamaking.com/forum/index.php/topic,6515.msg62814.html#msg62814.
Peter