My son is 21 mos, and some of his current faves are:
Puppets/stuffed animals. He is into pretending now and loves to feed his animals and then put them down for a nap. He likes the puppet b/c his dad and I can give it a voice and make him talk. DS doesn't nurse his "babies" though!
He gives them his sippy cup.
FP Little people farm. He likes playing with the animals. This was a hand me down, but we got another Little People set for Xmas - it's the circus I think.
Musical Instruments. We bought him a drum that came with maracas, a recorder, etc. We also have a kazoo and a xylophone. He likes making music.
Phones! But my son is totally and absolutely OBSESSED with phones. So we have all sorts of them for him to play with. I mean, his obsession borders on OCD, but I hear most kids this age love them as well.
Slippers, hats, any clothes he can put on himself.
We bought him a vacuum for Xmas, I hope he likes it. He sure likes watching us vacuum and trying to help. We also bought some pretend food and I'm getting him a Dr kit. His imagination is bursting, so I want to foster that as much as possible.
Keep the great ideas coming, ladies. The tape player is great! I never thought of that even though DS loves music.