I've been running a league for 4 years now and I've noticed the guys in my league tend to lean more toward free agency than they do trading. For the most part, the message board approach does not seem to work very well and often goes ignored. If you have a player who you know is in demand and you can afford to part with him, then by all means put him on the message board. It seems like it would be a good way to drive up the price and start a bidding war between a few different teams, all to your benefit. But throughout our league, and as for me specifically, I've noticed the best way to approach a trade is just to go after what you're looking for. For instance, I was able to construct a 3-team trade last week which significantly upgraded my RB position with minimal loss to me. Without approaching the owners and talking out the details, I would never be able to work this type of move out.