I have seen in some forums a seperate section in the index for classified adds roled into the forum itself. It makes a great place for people to exchange info and picts about the specific sale of boats and items listed in the class. adds.
Check out www.shoforum.com for some great tips . I think they do a pretty good job at setting up a fairly conservative and well run forum. Yes I have a 92 SHO.
Something that I think gives a friendly feel to the forum is the featured section. Start with yourself. Take a picture of your boat and talk about any modifications, if any, to your boat etc.....you see where I'm going. Its a great way to draw / introduce people to the forum without overwhelming them with technobabble. Sort of what you have on the landing page but more in depth.