As already seen in the Torque Vs Panda3d thread, its obvious that guest accounts can be abused. The guest idea is nice to have but is it worth it?
Perhaps for Guest accounts, linking can be disabled?
But this leaves them open to spam through many threads.
Maybe only registered accounts can post. This will stop people from posting as Guest by mistake (seen a few times 
) and curb any increase in spam on the forum.
What do people think?