Audible.com uses RSS feeds to provide new release alerts
Excellent use of RSS feeds to keep your customers informed. What a great (free!) service to provide your clients!
Clothing stores could let shoppers know when the new seasonal fashions are in stock, or when a delivery of new red shoes has arrived.
Music stores could alert feed subscribers of new releases and additions to their used-CD collection.
Restaurants could provide chef specials, bars could provide happy hour details.
Car dealers could alert interested buyers of available cars in-stock without ever seeming pushy or rude.
Go see what Audible is doing, and think about how can you adapt this concept to YOUR business.