I use these and I routinely daisy-chain two of them and get a good solid signal. In the past I've chained three just fine. Supposedly, you can chain up to five together but I haven't tried that myself.
http://www.newegg.com/Product/Product.a ... 6812224004I currently use these for Kinect but I've used them successfully with PS3 Eye cameras in the past. For Kinect, I typically use four cables (two each), plus a fifth one to extend the reach of the Bluetooth adapter. For PS3 Eye, I typically had no extension for the camera closest to the computer, one or two for most of the other cameras, and possibly three daisy-chained together for the camera farthest from the computer. Usually, I never had to go beyond two though.
I haven't tried the USB 3.0 model yet. They
might be better but they're also a lot more expensive.
G.