Here at Milkshake, we're happily spending the next few weeks giving you the scoop on great gifts that give back.  But for those of you who aren't about to deviate from those gift lists you've poured blood, sweat and tears into, there's still a simple way to make sure your purchases make an impact.

A clever app called Socialvest allows you to shop at more than 600 stores and earn back a percentage of each purchase to be donated to any of the 1.5 million charities in its database.  

Already on a mission to buy a certain perfume for cousin Sue and a particular gadget for nephew Joe? No worries; you can do a simple search of the stores and products in Socialvest's corner and purchase each item through the app itself. (Chances are, you'll find just what you need, since everyone from Macy's, Target and Nordstrom to Preferred Hotels, Southwest Airlines and The New York Times Store is involved.) Rather do a little browsing to find just the right thing for each person on your list? No sweat; try Socialvest's "web assist" feature, which bypasses the main site completely and lets you wander at will, free as a bird.  Out shopping randomly and wondering if that Furby you're holding gives anything back through the program? Scan its bar code into the app with your phone.  Easy as pie with one tap of your finger.

Once your shopping's complete, the extra funds earned are donated to your charity of choice.  Et voila: putting a smile on the face of your loved ones while making the world more merry and bright... all without changing one speck of that shopping plan you've been perfecting since Thanksgiving.  Don't you love it when a plan comes together?