I am really digging the Booking Calendar plugin. After researching all available options, this one was by far the best.
I needed a plugin that would provide a calendar and form for customers to book dates for a venue, and this one is perfect. It has helped me to design a simple booking setup for my clients website. My clients are going to be very pleased, as this will help their business dramatically. Their old website had a very, very bad process for booking, where you have to create an account before even checking availability.
Using Booking Calendar, we're working to create a simple and intuitive user experience for my client's customers, while organizing the bookings into WordPress.
I'm using the Premium Edition version, which is sufficient for this use.
Check it out.