ef ~atom~ (kids but good)
Kare Kano (kids but good)
The Skullman (adults, romance is minor but well done)
Koi Kaze (one adult and one kid, romance is shockingly well done)
Bible Black (adults, kids and demon-penises; so well done it's the only animu universally recommended by /a/)
Honey and Clover (obvious)
How do you feel about Macross-style romances?