I post mostly on Yahoo because this is the easiest for me to navigate, and sooner or later there are enough people that read TMF, SI and Yahoo that the cross pollination factor works. I read all 3 on selected threads. SI is about as easy to navigate as Yahoo. My only real objection to SI is being asked to pay for the privilege of adding value to someone else's product. Especially when the product is a high tech bulletin board and the only enhancement service from the host is a limited amount of gatekeeping.