I am due with my second boy in April. 2 of my good friends are throwing me a shower. While there are quite a few items we actually NEED for this little guy (a lot of my first's stuff was second-hand and just plain wore out after he was through), I didn't want my friends/family to feel obligated to buy, especially since they boys will be less than 3 years apart. So, we registered, and included the cards, but wrote on them that gifts were optional (I believe they used the phrase "We request your presence, NOT your presents"). I wanted it to be more about celebrating my new little boy and less about gifts . . . but neither did I want people to feel like they COULDN'T buy things. ( :
Have a shower!! Have fun!!