God yes, outfits! This time I'll get quite a few more vests and sleepsuits - that's all DS wore anyway for the first 3 months.
Baby bath, especially the expensive moulded ones.
The glider chair and stool, however, I still use now, and think they're one of our Best Buys. (Mind you, DS didn't sleep through at 9 weeks. Or even 9 months.)
Disposable wipes or even cotton wool - horrible stuff! We've got lovely fleecy wipes now - much nicer.
Breast pads - I had loads of them and never leaked a drop!
Cheap nursing bras. What a bloody waste of money. I could have bought 3 really good ones for the amount of dosh I frittered away at Mothercare or M&S. If you're over a C cup now, get yourself to John Lewis and get a really good bra!
A Baby Bjorn carrier. There are better slings out there!
Parenting books that a) make you doubt your own abilities as a parent or (even worse IMHO) b) make you doubt your baby's progress/development.
Baby bath/shampoo/lotions.
Talcum powder. Never used it - the thought of putting powder on my baby's bits? Bleurgh!