Top 5 hey? That's tough.. way too many but I'll give it a go

1. Hearing them say "I love you" in their cute little toddler voices
2. Watching them come flying out the door when you get home from work and being totally swamped in little hugs and kisses
3. Seeing my 4 y old daughter approach a child who's being left out of the game at the park and involving them in what's going on.
4. Seeing how the really simple things excite and delight them... things like a pretty flower, a swim at the beach, a ride in the car
5. Having my 2 y o son sneak into our room each morning while it's still dark ( :-s ) and put his hand on my cheek and say "hello Mummy", when according to the specialists he was supposed to have died at birth.