I've actually read (somewhere) that washing strengthens the silk fibres while dry cleaning can weaken them. I don't know if that is true.
Anyway, I am in Greyscale's camp, If I had to dry clean, it would never happen. It's just too big a hassle to take the stuff in. The only things I dry clean are my wool coats, wool or wool blend blazers, and a couple of pairs of wool trousers.