I have been working on a Wordpress Booking plug-in. It is currently in the early stages of development (very alpha); but what I have done so far appears to work OK. You are welcome to check it out at http://demo.stackemedia.co.uk/.
So far, you should be able to make a booking via the front-end and the admin. You should get a confirmation message when you do the booking; I would use a service like http://meltmail.com/ to test – so that you are not displaying your email address.
Further instructions on the site.
If you have any comments or things you would like to see in the final plug-in; please add them to the demo sites feedback page.
