My top 5 are:

DIDN'T USE
1. Dummies & bottles (he won't take either - what a waste of money)
2. Size 0000 & 000 two piece outfits (too awkward and useless)
3. Fluffy/stuffed toys
4. Nappy powder (still haven't used any)
5. Nappy wrapper (we used it early on but the cartridges are so expensive so we don't use it now)

COULDN'T LIVE WITHOUT
1. Rocking/glide chair
2. Angelcare movement monitor
3. Cloth nappies & bibs for spews
4. Lightweight stroller for trips down the street
5. Pillows to prop bub up into sitting position a few months back (great for his reflux)

Another thing I must say is that we got 2 car seats (both Safe & Sound)...one that was an automatic retractor and the other is manual...the automatic one is SOOOOOOOOOOO much better (easier & quicker) and I wish we'd gotten two of them instead...