I always say that Logos saved my life in seminary. It saved my marriage. It saved my sanity. It saved... you get the point. I can not recommend this resource to pastors or Bible study leaders enough. While I still love a good library full of leather bound books, Logos saves so much research time. Seminarians, you cut and paste from a resource and it will add the citation for you. You can even format which format your school makes you use. Yes, it's a bit pricy. However, it is worth the investment. 
