I have a few t-shirts I wear that get people talking (free betty being one of them!) and stickers / fridge magnets I put up at work.

Also my coffee cup - it's a BB one, but I use it for my coffee every day from the cafe, and they now charge you 20c less if you BYO cup (I'm about to ask them to change their sign to "COFFEE - $2.80. Disposable cup - 20c extra" instead of "get 20c off for your own cup"). Because it's a big cup, people look at it and realise it's more than the medium size coffee (for $3) and possibly bigger than the large coffee ($4.50) so they start to bring their own cup. Nobody who sees me going to get my coffee is game to be seen with a disposable cup in their hand! Oh yeah, and people ask what BB is too, and I tell them its about empowering parents and those who want to be parents etc about safe birthing and child raising ...

With food, well, at our table at the Melbourne Mega-meet (queens' birthday) I asked if people would mind not ordering grain-fed meat because it's ethically bad (given the amounts of antibiotics fed to the cows to actually keep them alive after changing their diet from pasture to grains - it's horrid).

I also sell my own eggs (ummm chook eggs!) at work with photos of my happy chooks on them ... a lot of people ask how many chooks I have and when I tell them that 4 chooks is more than enough to supply us with eggs, and sell a dozen / week which pays for their food - and also that they follow us round the backyard and are so relaxing to hear that people are asking me for advice on getting chooks!

What else ... BFing - I make a point to say when I see a newborn "oh well done on your son/daughter, I just love their little breastfeeding lips! You can always tell when they're on mumma's gold!" and if anyone expresses interest in my cloth addiction, I lend them some nappies to either try out or get an idea of (if they're preggers and don't have a child to try them on).

Oh, and I lend books. I've been known to buy multiple copies of books just so I can lend them out (I follow the maxim don't lend what you can't afford to lose) to people. Specially stuff like Peter Singer ethics books etc.

Oh yeah, and I petitioned my boss to buy fairtrade coffee instead of nestle instant evil.

Great ideas with the post-it notes!!!! A friend of mine (in a wheelchair) carries pre-printed notes and a tube of super-glue to stick on the windows of rude people in carparks!