For those interested in visiting the Cheetah Outreach in Somerset West, I'd like to share some information regarding how to get there from Capetown. You can actually take the Capetown Metrorail from the main Capetown station directly to Somerset West for about 12 Rand. It takes about an hour or so to get there. Trains run regularly about once an hour, but you can check this website for the schedule: http://www.metrorail.co.za/Timetables.html . I think the Strand-Capetown line is the one you want to look at, but the information desk clerks at the Capetown train station are really helpful as well to direct you to the correct platform.
I actually took the line from the Observatory station to get to the Capetown station first, since my hostel, the Green Elephant, was in walking distance of the station...only 8.5 Rand, if I recall correctly. So, you may want to check to see if there are any stations near your lodging.
The metrorail seemed fairly safe...although I went during busy daytime hours, with people obviously going about their business to and from work. I'd stick with trains that have plenty of people in them, using the normal precautions. A horde of police came through the train on the way back and were doing random searches through bags, backpacks, etc.; a local I spoke to suggested that they were probably searching for weapons such as knives, and that it's quite typical, not necessarily precipitated by a particular incident. Not sure what to make of that but they didn't search or harass me, fortunately. It was a bit tense, though.
Once arrived at the Somerset West station, probably best to take a brief taxi to the Cheetah Outreach...which costs about 50-60 rand or so (for the taxi).
As for the Cheetah Outreach itself, I thought it was fantastic, as they are using the proceeds from the encounters to help breed Anatolian Shepherd dogs that help eliminate the farmers' desire to hunt/eradicate cheetahs from the land(cheetahs being generally less aggressive, the Anatolian Shepherd is able to keep the cheetah from attacking livestock). The success rate of this effort is astonishing- they just need more funding to keep the momentum going and to supply more farmers with the Anatolian Shepherds.