Hehe, kinda depends if I know you.  If you're a 
repeat customer and I kinda know ya, you don't 
have to worry.  I just like having the address 
included in the email order so I don't have to go 
digging it up.  :)

But if you're a newbie and place an order without 
giving your address, you can expect the order not 
to get filled and get a "need more info" reply.

I've even turned down email orders becuase the 
email itself was soo damn sloppy.  That tells me 
they aren't serious about making a purchase.