Web site Flipswap makes it easy to sell, donate, or recycle your old cell phone or iPod. We've highlighted similar services in the past, like previously mentioned Celltrade, but Flipswap has a few features that make it stand out—most notably, the service is completely free, meaning they even pay shipping costs. If you're looking for a little cash for your first generation iPhone, for example, Flipswap is seeing trade-ins close to $200. If you want to donate, you can pick a charity or trade your phone in for a planted tree. If you have any experience with Flipswap, let's hear how it worked for you in the comments. Flipswap [via TechCrunch]