Ok people, I have good news!
We've been doing some analysis of the anti-spam measures that we've implemented over the last year and we've come to the realisation that some of them haven't had the effect that we'd hoped.
At the same time we're hearing your frustration at being 'punished' for the actions of the minority.
So we've reversed a couple of rules that we hope will make you happy.
1. All forum signatures are now visible to everyone, including guests
2. Users can now post links, regardless of how many posts they've made previously
It is important to note that for now signature links are still no-follow, but you'll be able to take advantage of much higher exposure and hopefully that will increase your click-through traffic.