The forums went down about 12-18 months ago, when they finally came back online the forums have limited functionality, they'd lost their layout, graphics etc.
It doesn't help that it's a very old and dying board over there with the site owner Darren being seen only sporadically since 2006.
I presume they closed registrations due to the amount of spam they started to get back in Dec 2010 / January 2011.
The best bet if you wanted to fire up this old thing is to visit Doc's mod page:
http://www.angelfire.com/fl5/bombardier/help_links.htm
As for discussing things with people you'll be hard pressed since it is rarely posted in anymore and has an active membership that only just scrapes into double digits now. Which is a shame as it was once a very bustling and popular site.
V