Registering for baby #2?

Kelly
I was just wondering what everyone's thoughts are about registering for a 2nd baby. And what are the best items to get with 2. My daughter will be 3.5 when her sibling arrives and I have had friends tell me I should register. This never really crossed my mind, but even if this baby is a girl, it won't be in the same season my daughter was. I will still have to buy some new clothes. Some people told me to register just for me to keep track of things we want/need, and to get the completion coupons at the end to buy expensive items like a double stroller. I won't be having another shower as far as I know. Thoughts? Thanks!