It's maybe a bit naff and newage, but wouldn't it be nice if everyone blogged (even just anonymously) one NICE thing that happened to them each week, be it this kind of thing, or just someone letting you sit down on the bus. Mine was someone letting me have the last pack of coffee on the shelf: they were ahead of me and saw me check if there was any more on the shelf, asked if I'd run out (I had), and handed me the pack they'd picked up because they were just stocking up and had plenty at home. Really really minor, but heartwarming and human for all that.