Hmm, I was given a shower with #1 by family but with #2 my playgroup mommy friends threw me a "mom's dinner out" surprise shower which was soooo sweet!

I don't think I'll have any kind of shower this time except what the playgroup mommies pull off which is fine with me... although I'd love a bunch of Target or Amazon.com giftcards so I can buy the expensive carseats I want and a decent stroller for when I don't use my pouch carriers.

I kinda think if you don't feel bad about it and your friends want to host it, why not? If you're not comfortable and your friends offer again, maybe you could request that they coordinate a welcome baby party after the baby comes.
eta: everything I registered for is a big ticket item because I have all the little stuff already. I'd feel bad asking anyone but family to buy anything on it and don't really expect that anyone will... just hoping for gift cards to make the expense easier. Ya know, things like an infant carrier because my newbors are too small to look safe in convertible seats at first, a convertible seat for when baby is bigger, a stroller and a glider/ottoman- I've never had one but would love one!