Don't buy a Tomy or whatever the other "baby like a small frog strapped to your front with limbs dangling" baby carrier is called.
They're shit, you'll use them for about 20 minutes in total, the baby will hate it and your back won't thank you.
Instead, buy a wrap or pouch or ring sling - your baby will be much more comfortable (I have a wrap sling that I LOVE), your back won't hurt and you can use them (child willing!) till they're three.
Apart from that - baby sleeping bags are a must, IMO.
Don't bother with a baby bath - heavy once full, just use the basin or else get one of those support things for the big bath - Mothercare do a flannel one.
And unless you have endless money and don't mind CLUTTER wait till the baby's here to buy anything but the essentials. You might feel different about clothes and toys and things once the baby's actually here (don't buy babygros that fasten up the back - they're made by the devil, I tell you).
Don't bother with a nappy wrapper.
Basically, if you think it looks a bit gimmicky or if it needs slick advertising to go with it - it's probably not necessary. But sometimes unnecessary is quite fun and there's always eBay 
Good luck.
I'll stop writing now... 