Usability 
RadioShack (aka "The Shack"), the ubiquitous (over 6000 stores and a big on-line business) US retailer of electronics and gadgets, has a new mobile site. Mobile visitors to radioshack.com are redirected to the mobile property at m.radioshack.com. The well designed mobile site adapts itself to work well on everything from the old Openwave feature phone browser to the iPhone 4.
The mobile Radio Shack front page lets you browse RadioShack's huge on-line catalog by category, search for a particular product by name or keyword, find a nearby store, follow the SHACK on Twitter or Facebook, sign up for Email deal alerts or launch a (non-mobile optimized) Battery Finder.
Individual product pages include a product image, extensive descriptions and "Add to Cart" and "Find a Store" buttons. There are also buttons to email or Tweet a product link.
On-line purchases can be made using your stored RadioShack.com account's billing information or by entering shipping and credit card information.
The Find A Store feature uses geo-location if your device supports it and lets you search by zip-code if it doesn't. Nearby stores are shown on a map or list depending on your device's capabilities. Individual store details include address, hours and phone number.
When called from a product page the store search doesn't appear to be inventory aware (the same list of all nearby stores appears for every product). The store phone numbers aren't click to call either so checking if a product is available locally is harder than it needs to be.
Radio Shack's small footprint retail stores are found on small town main streets and in the malls and shopping districts of all US cities. They carry everything from electronic components and batteries to audiophile gear and a large selection of prepaid and contract mobile phones and accessories.