Hi, I have the same problem, how to connect this camera to arduino?!!!
And I discovered this:http://qrfnfgre.wordpress.com/2012/05/07/ov7670-camera-sensor-success/
That it's a realy good job of this guy, and the best, he recomend this link:http://mbed.org/users/ms523/notebook/ov7670-camera/
Here the guy explain how to connect the camera to the arduino, and make one test with it and a TFT display, and give the code for anyone can test, this it's realy usefull
I discovered this too:https://gist.github.com/freespace/2585921
This look like a testing code, but we have to read and understand what it's realy, so it's more heavy
I hope I can help you.