Our daughter is only 4 weeks old, but a couple things which have been useful so far are:

Cloth nappies have been reallly handy to use as spew towels.

CD player to go in babys room. She settles well to music at night.

Wondersuits. So easy to do up and take off.

Portable change mat. good for when you are out somewhere and theres not really anwhere good to change baby.