[thelist] Forums - integrated solution versus standalone

[Chris George]

Hi there,
 
Does anyone know of any forums (basically just threaded discussions)
that are easily integrated into existing web systems?
 
We develop in a .net environment and would prefer .net, but basically,
beggars can't be choosers. :-P
 
Our biggest concern is around security, and integrating with our
existing security model, versus their own method.
 
Any ideas?
 
Chris.