We recently added a best-selling sort-order for collections allowing you to sort a collection so that the best-selling products show up first in the collection: a great way to showcase your top performers.
If you are currently manually maintaining a list of best-sellers then you definitely want to take advantage of this new feature. It may also be a good idea to take advantage of this for your frontpage collection so the first thing customers see are the most often purchased items; a popular sales technique that often leads to increased sales for your shop.
