I use a standard user account for my daily tasks on Mac OS. Since upgrading to Snow Leopard I am asked to do the following when a program is run from within Xcode:
\
For me, I found the suggestion in the following thread helped:
Stop "developer tools access needs to take control of another process for debugging to continue" alert
It suggested running the following command in the Terminal application:
sudo /usr/sbin/DevToolsSecurity --enable