Type in 'Spaceflight' on a Yahoo club search engine, there are loads.
Looking for a site/forum like this, I went to www.cosmiverse.com
While there are some quite good, if rather infrequent, discussions on this site, there are loads of UFO freaks, creationists, 'Apollo was a fake' conspiracy nuts too.
As 'GB' I answered a few not very intelligent questions, flamed the nuts listed above (with reasoned arguement of course!), now I hardly go there.
If anyone thinks that this site is spoiled by silliness you should take a look there.
A separate Spaceflight page here would be great, but rather limited in appeal.