Ugh. It pains us to admit it, but the company that tops our hate-to-love list is funded by none other than @aplusk himself. Kutcher put a million dollars into this simple, slick-looking travel site in October 2010, and the company's been adding convenient features at a steady rate since. Like Kayak and Priceline before it, Hipmunk offers an easy way to find and book flights and hotels. Unlike its competitors, it can't confuse you, since its design is so clean and easy-to-use that making reservations is actually kind of fun. We just booked a plane ticket for Mother's Day Weekend (don't tell Mom, it's a surprise) and can't wait to use it again. Equally pretty mobile apps and Google integration sweeten the deal.