We're having another boy so we REALLY don't need a lot of stuff, but our little guy is only 2 and still in his crib, so this is what we've accumulated so far:
-another crib and mattress
-dresser that will double as a changing table
-diapers and wipes
-another changing pad with covers
-bedding (3 pairs of sheets, bumper and ruffle)
-clothes (DS was born in December and this baby will be March, so slightly different seasons) - not too many clothes
-a lingerie bag for baby socks
-an extra bouncer (to keep at the IL's house or my moms)
-another diaper champ
-a rock n play
-lots of books