Our pool table store is about to start a website. It's being worked on right now. I'm not so sure what all is going to be done. But I agree that websites are key to any business now.
A lot of places have also started using "Myspace" to promote their bar/pool halls/etc. They allow people to add themselves as friends to the place of business. That way they can recieve bulletins about say tournaments or specials. And the locals can interact with each other on the web page. It's also free to do and easy to set up. Chances are many people in your poolhall right now are on myspace. Even the Marines have a webpage that you can add as a friend.
Here is a group (Which is different than a profile) I started called
Georgia Billiards. I took it and made it as simple but interactive as possible. I linked other similar groups (And they did the same for me) on myspace. Then I made a section that features pool halls in Georgia with Websites. Which you can look at to get some ideas. And if you go to the link for "THE INDEPENDENT" you'll see what I mean about a pool hall with a friends account there.
Hope this helps and good luck
Mark