Limb Savers would be a good start. Then I would get a Doinker stabilizer, some String Leechs, then if you want to, you can get some mini limb savers for your bow sights. They don't reduce sound much, but they do absorb the shock well so your sight pins screws don't get loose.

this is Limb Savers website:
http://www.limbsaver.com/Products/Archery/Super_String_Leech.aspx