Five mobile apps to heat up your summer

It's Memorial Day weekend--the unofficial start of summer. For the millions of Americans shutting down their PCs in favor of beaches, beers and backyard barbecues, mobile devices are now as much a summertime staple as flip-flops or sunscreen. Thanks to smartphones, staying connected no longer means staying indoors--between navigation tools, weather applications, local entertainment guides and thousands of other consumer apps, it's easier than ever to access the information you need regardless of when and where you need it. Here are five cool apps for the hot months ahead.