I'm a big fan of the AirAmbulance ad we have done things like donating a laptop for fund raising, included their logo on our own offline marketing, and outside of the business I donate to them.
It's obvious PR capital and I like the idea of a charity that really does cover all boundaries, races, backgrounds, beliefs etc. No one ever knows if they will ever need an Air Ambulance, but you can be pretty sure you won't find many people that would refuse help from one if needed.
I do think you have to be careful and consider your own business and brand when looking at charities, as do charities when looking at businesses. Some charities can rightly or wrongly cause emotive reactions, and if some of those are from your customer base, it could impact sales/revenue.


Very interesting article from Search Engine Land which you can read in full here: