Grid Snap = Hold X
Vertex Snap = Hold V
Curve Snap = Select vertex, hold C then hover over the edge you want to snap it to and press MMB to slide.
Angle Snap = In rotation options, listed as discrete rotate, with angle being 'step size'.
Freeze (XForm) = Modify-freeze transformations
Pivot Reposition = Insert key (press again when done)
Pivot Recenter = modify-centre pivot