Sounds like as far as your URLs go, you are doing fine.  There is no need to have to have the .html at the end of any pages.  What I would suggest is to go out there and get more like-minded web sites to link back to you, so the search engines have more ways of crawling to your web site.  Also, you might try the official search engine submit wizards listed here from each of the big search engines:

http://wiki.lunarpages.com/Search_Engine_Optimization

Might take a while to see the effect, but once you submit via those links they will at least know you are out there.

Your forum seems working fine. You need more back links to make Google index more pages of your site and shorten the period Google crawls and indexes your forum. Unless your site exhibits some sort of importance, Google will not likely send significant traffic to you after 1 or 2 months of indexing your site anyway.