vordmeister - 6:24 pm on Oct 5, 2010 (gmt 0)
The XenForo source code hasn't yet been released, so it would seem unlikely the lawsuit is based on code similarities. In any case XenForo have mentioned they have quite a different architecture to anything else.
Equally it is likely that a developer will not ignore prior learning. That's what they call experience.
A lawsuit like this will surely be won by the side with the most money (the side that can afford to keep going the longest). That is unlikely to be a small bunch who have been developing software for the last couple of years instead of making money.