Top 10 rankings: No. 1 for training, No. 1 for retention, No. 2 for benefits Career development is a priority at this Arlington, Va.-based organization, which represents consumer-owned power cooperatives. A mentoring program pairs IT staffers with seasoned leaders, and in 2012, 98% of IT employees attended custom on-site classes and workshops targeting specific areas of technology expertise. Civic-minded employees may use up to three paid days a year to volunteer with a local charity or community group.