The Pittsburgh Penguins are more than likely going to lose Paul Martin and Christian Ehrhoff via agency this summer. And, that actually might not be a bad thing.
Fortunately for the Penguins, they have a wealth of young defensemen that should be ready to make the jump to the NHL next season. This, combined with the high salary cap hits that Martin and Ehrhoff will certainly ask for, will make it hard to re-sign either defenseman.
However, unfortunately for the Pens, Ehrhoff and Martin fit really well with the system that Mike Johnson has implemented.