Filling a need we didn't know we had until just now, a pair of developers have created a website that tracks your fill-ups in a community setting. Dubbed "Fuelly," because every web 2.0 application needs an adorably misspelled name, the site is actually quite fun and full-featured. Just add your car to the system and start tracking your mileage, how much you spend on gas, how you stack up to EPA estimates and how much you'd save by improving your mileage. Join now before weirdo dragons looking for 13-year-old cars take over the site. One of the best features of the site is that it allows you to see how your particular make and model compares to other identical vehicles. And if you're using an iPhone or other mobile device, the mobile page lets you update your mileage on the fly. Overall, we think Fuelly will work out better than our current system, which involves writing down the mileage on gas receipts and then losing them when we empty out our full wallets. [Fuelly via AB Green]