RadioShack is basically a cell phone store anyway. I don't see it being a huge benefit for Amazon.
Always have your stuff when you need it with @Dropbox. 2GB account is free! Click here and get an extra 500MB!
Get 5GB of online storage for free from SugarSync. Click here for an additional 500MB to give you 5.5GB for free.
Get 15GB of online storage at Copy.com plus an additional 5GB by clicking here for a total of 20GB