The USBVision driver provides support for USB video devices based on the Nogatech/Zoran NT1003/1004/1005 chipsets.
The driver was formerly developed on a standalone basis, but has since become a part of v4l-dvb (i.e. falls under the LinuxTV umbrella). The driver is now integrated in kernels 2.6.20 and greater as "usbvision" module (USB 5).
For older kernels, you may use the v4l1 version, which you will find on the USBVision Project site on Sourceforge. Get the CVS version to get 30fps and mint video output (see announcement).