Photon scattering from a strongly driven many-particle system is investigated. The second-order correlation function for light emitted from a strongly and near-resonantly driven dilute cloud of atoms is discussed. It is shown that photon scattering from strongly driven multi-atom systems exhibits bunching together with super-Poissonian or sub-Poissonian statistics. Next, squeezing in the resonance fluorescence emitted by a regular structure of atoms is discussed. In a suitable modified environment, squeezing even occurs for a resonant driving field, in contrast to the regular vacuum case.