Po5 - I still sterilise, I find that after washing the bottles/teats they have kind of an icky residue left on them. I'm not as strict with sterilising as I used to be though - I have an Avent electric steriliser and sometimes once the cycle is done it will be left sitting for up to 40 mins if I'm busy doing other things. So I don't know if the bottles would still be sterile after that time, but at least I know they have gone through the process itms.
I think I'll do it until she goes onto cows milk, it doesnt take that much extra time. I dont think it ever occurred to me not to sterilise!

