I've always tried to sit in on a few sales calls at any place I've worked and have encouraged people working for me to do the same. It's valuable to see your products from the Sales team and customer perspective. The surprising thing I've observed is how great sales people spend most of the call listening to problems, not offering solutions.
I always have every member of the exec team attend a sales call per quarter. Yep, even the CFO. Amazing the impact it has on the staff meetings, much less the decisions made.
