Defect by Kikkimax is one of my favorite SPN/Criminal Minds crossovers, and it has a sequel, too. Of course, you've probably already run into these two stories. Summary: Crossover between SPN and Criminal Minds. Goes AU before SPN season 3. Dean's year is almost up and he finds himself a guest of the BAU. http://www.fanfiction.net/s/3849310/1/Defect

This Bitter Earth by Artsavage is also a good SPN/Criminal Minds crossover. It involves a case in an old plantation home. http://www.fanfiction.net/s/5361724/1/This_Bitter_Earth