I have to say, I am all for keeping spammers off the forums, but I have noticed that your captcha system is really wonky in what it is displaying. I had to hit the new image button several times before I found one I could understand.
There are several sites out there that are using question and answers. Others are using pictures or areas to click on. I understand that switching systems might be difficult, but is there any possibility of have the images clearer on your system. It is bad enough when the letters are all scrunched together, but the worst are the ones that have the text broken in some way.
Other than that, I am looking forward to exploring your site. Thanks