Hi Admin folks (and others that might be interested!),
I dont know if phpbb has any kind of facility to implement this scheme, but I signed up to another forum recently that had a good spam-proofing method...
Basically, you had to achieve a post count of 10 before you could post to any forum section except one. The way it works is that people with a post count of 10 or less are restricted to a single forum section. There's a forum section just for newbies that has 10 threads in it, and no new threads can be started there... New members just click each one, post 'test' or some other bit of junk, and do the same for each one. When their post count reaches 10, they're able to post anywhere. That way, no spam bots can get through. Any interest in that? I reckon maybe reduce it to 5 or something becuause 10 was a bit of a pain. They also organise it so you cant post twice in less than 10 minutes to the same thread, or it joins your last few posts into one, which is also a pain in the a***.
They also have some really nice forum software called Invision Power Board (v2.1.7).
If anyone is interested in checking it out, it's the Australian Digital TV Forums: http://www.dtvforum.info/