I must admit, I have eaten at restaurants and seen this logo without paying it too much attention. I never really took the time to check it out properly but I'm glad I finally did. StreetSmart is a fairly simple concept. Basically, participating restaurants have a card displaying the StreetSmart logo which gives diners the option of adding R5 to their bill should they wish. You can add more if you want, all you have to do is fill out a card. It'll take a few seconds and you can leave knowing you have done your small good deed for the day.
The money is then split between three charities, all aimed at helping children who are forced to live on the street. The long-term goal is to obviously have as many restaurants as possible participating and the concept seems to be growing fast. For a full list of restaurants who are trying to help check out http://www.streetsmartsa.org.za/
Keep your eyes open!