I'm with tashybabe and Audax - i think a bank account is a great idea.

I did not buy things. Not because i'm superstitious, but i didn't want to see things that reminded me that i was TTC for so long. Even when i saw things on special - i resisted the urge.
I'm glad i didn't buy stuff as I would have changed my mind on carseats and carriers and baths etc, as new and improved ones hit the market.

Blankets you will proabably be given lots for bub.
Bottles - don't buy yet, you never know how you might be feeding your baby.
Jumpsuits can always be picked up fairly cheaply any time of year.

JMO though.