With the well-designed WootWatch (available here), we can monitor what's on sale anywhere we go. It even let's us know when there's a woot-off-it which a myriad of helpful and hopeless items are sold off in quick succession-complete with the site's spinning lights.
Woot.com has grown and this app supports all it offers, including the daily t-shirt sale and the daily wine bargain. When you find something you like, you can buy directly through the app. The latest update includes an alert that lets you know when a new item is available.