I tried the brine recipe from Kellyguinn:
BRINE
1. 2 QUARTS WATER
2. ½ CUP KOSHER SALT
3. ½ CUP BROWN SUGAR
4. 2 TB GARLIC POWDER
5. 2 TB ONION POWDER
6. ¼ CUP APPLE CIDER VINEGAR
After soaking for a day, I dried the turkey breasts off with paper towel, then added some kickin' chicken rub and let sit until charcoal grill was ready. While cooking, I applied butter to keep from drying out. Turned out really good.