I say "i love you" to my older DD when she goes to bed, when she goes to school, if shes upset or if we've been on the phone its the last thing we say to each other (She's 13, i think if i did it anymore it would just be "uncool"!!).
To Emily im always saying "mummy loves you soooooo much!" this i do all day - just so she's sure!! lol.