I've found a great line of hair products that I really enjoy using, so I thought I would share it with you. It's not made specifically for silver/gray hair, but I like the way it makes my hair feel. It's John Masters Organics. (click for link)
Available at Whole Foods and some health food stores, I get mine at The Vitamin Shoppe. It's also available online. (see link above)
This fairly extensive hair-care line addresses all different textures and conditions...dry, normal, oily, damaged, etc. My favorites right now are the Lavender Rosemary Shampoo for Normal Hair, the Rosemary & Peppermint Detangler, and the Shine-On/ Leave-In Treatment for supernatural shine and softness.
Skincare, body care, products specifically for men, and even pet care products are also available.