Craigslist.com, CarpoolWorld.com and ZimRide.com are three websites through which users can set up rideshares. The rideshare board on Craigslist is commonly used for ride-sharing listings in the United States; search on the local Craigslist in your city of departure to find relevant listings. CarpoolWorld.com and ZimRide.com require registration, which can make it easier to verify the trustworthiness of your drivers and passengers.
CarpoolWorld is a website with registered drivers and passengers around the world numbering in the hundreds of thousands. It features a review-based system, which lets you see past feedback for both drivers and passengers, helping you get a sense for the character and trustworthiness of your potential travel companions.
ZimRide is a fast-growing customized private ride-sharing network primarily geared towards carpooling for regular commutes. It uses social media such as Facebook to help verify your potential drivers or passengers, and is backed by Enterprise Rent-a-car to complement existing ride-share services with car rentals.
Craigslist offers no way of validating users or drivers, so arrangements made through its listing boards are entirely at your own risk. Before embarking on a trip with a stranger through Craigslist, make sure to get as much relevant information as possible. Make sure to discuss your arrival and departure times, and whether those times are fixed or flexible.