When I was talking to my wife last night, it came up that blinking slowly at a cat is supposed to be a way to tell them that you love them. She said that when she tried it with her parent's cats, one cat slowly blinked back at her and the other cat started purring.
I tried it with our two cats and both ignored me, although I rescued the small one when she was still only a few weeks old, so she probably doesn't have the same behaviors / experiences as a normal cat.
Is it true that blinking slowly at cats is a way to communicate the message that you love them? My thoughts are that it's maybe more of a signal of trust, but I don't know for certain.