  We review recent 3D hydrodynamic calculations of stellar collisions using the
Smoothed Particle Hydrodynamics (SPH) method, and we discuss the implications
of the results for the formation and evolution of blue stragglers in globular
clusters. We also discuss the construction of simple analytic models for merger
remnants, approximating the mass loss, shock heating, mixing, and angular
momentum transport during a collision with simple algorithms that can be
calibrated using our 3D hydrodynamic results. The thermodynamic and chemical
composition profiles predicted by these simple models are compared with those
from our SPH simulations, demonstrating that our new models provide accurate
representations of true collisional merger remnants.
