I do photography just for myself normally, and for my pictures I like to use Faces. However, I've also done some photography for groups. I don't want Faces to try and tag these people, because I don't even know them! Is there a way to turn Faces off for certain projects, but not turn it off totally?
Aperture 3, Mac OS X (10.7.3)
No, faces is an all or nothing proposition.
Being able to have faces on for just some projects is a good idea and has been mentioned in the past. You might want to send Apple feedback for this. See Aperture->Provide Aperture Feedback
I have a similer thing since I use aperture for my work and for personal things. I use seperate libraries. Create a seperate library from the file menue. (File->switch library->other/new) make one for work (no faces) and one for personal (faces enabled) It's not as simple as setting it on or off for each project but it does work for me.
Can you turn Faces off for specific Projects?
