As has been mentioned before, we all have different tastes, and our babies will have preferences too

The things I think are indespensible are:
Boppy Pillow ~ I used this everyday, all day long

good bras (at least 4)
breast pads
sling ~ try different ones, I like my unpadded ring sling best for nb, but when DD was about 5-6 months I liked my hiphugger better
for bathtime, I found a neat mesh bouncy seat thing at bru.com, but they no longer sell it

I would put it at the end of the tub, and let DD sit there while I washed my hair. It worked wonderfully!!! I'm glad I kept it! I liked having baby towels at first b/c baby's skin is so tender, but after a few months I just used regular towels/washclothes. My favorite soap is the wal-mart, Parent's Choice lavender

Horrible, Iknow, but BBs bar didn't work w/ DDs long hair.
For sleep, make sure you have a good place for baby to nap. I used a bassinet last time, but got rid of it b/c I only used it a few weeks, then used the crib (oh, no!). This time I am planning to use DDs playpen thingy that goes to a bassinet? I think I might put a sheepskin in there or something? I am also thinking of getting a snuggle nest, just not sure yet?
I never used any bottles, but DD took a sippy at about 3 months. (Yes, breastmilk in a sippy, not a bottle

) She HATED bottles, and I still have several brand new, never even sterilized ones. I really liked the avent system, and got the sippys, with some bottle nipples to use, when I tried that. If she would have taken a bottle, great, but since she didn't, I still go to use them for sippys!
One thing I found absolutely necessary was those flannel waterproof crib pads! I cut them in half and slept on them, then later used them to change DD on. The lap pad ones are too small, but the crib sized ones cut in half are perfect! You can put them straight on the bed, and it's not uncomfortable. The sheets stay clean, and I would usually get up and change the pad once or twice a night. I leaked like crazy the first few months!
I'm sure there is more, but I'm running out of time!