A very active innkeeper forum, where you can get a lot of your questions answered. They also have good links to innkeeper resources.
Inns and Bed and Breakfasts for sale. A marketplace to find your new inn property, or to list your B&B for sale.
One of the original bed and breakfast directories is being relaunched, and they are allowing innkeepers to add their B&B listings for free.
Lots of good information about bed and breakfasts, with specific sections for aspiring innkeepers.
Bed and Breakfast sales and consulting. An absolute must if you are considering a property in Michigan
Sale listings, articles, seminars, and all-around great insight into the industry. One of the first B&B sites I ever visited.