Which internal WAN protocol?

[Richard Dunn <rdunniii () mac com>]

I would appreciate it if list members could tell me which WAN routing protocol(s) you use and why?  If you have changed 
from one to another what did you change from to and why did you make the changeover?  If you use multiple protocols or 
same protocol redistribution for specific or other  reasons if you could explain why I would appreciate it.   On or off 
list as you prefer.

Thank you.

Richard