Virgin Mobile USA announced an agreement with mobile marketing firm GPShopper to add Slifter, its location-aware shopping application, FierceMobileContent reports. Some analysts are predicting that mobile couponing could take off now that the economy is tanking (hey, we'll take any good news we can get at this point).

For the uninitiated, Slifter uses location-based search to let users search over 300 million products at more than 150,000 local and online retailers. They can also browse price and availability, and receive detailed directions to the nearest store, according to the article.

Users can also share coupons with family and friends, and can put together mobile "shopping lists." If you're on Virgin Mobile, try it out via the VirginXL portal in your cell phone's Web browser.