Zipcar to blame for that. Ever since the introduction of its iOS app back in 2009, users have been able to reserve a car on-the-go, and freak out unwitting pedestrians. Now Android users get to join the party -- officially. While the apps' market availability is nothing new, the recent shucking of its beta tag and some UI enhancements make this coming out party noteworthy. There's a good reason Time Magazine named it one of the "50 best iPhone Apps in 2011." Also, wireless honking -- in case you forgot.