General:
g - Move
r - Rotate
s - Scale
Tab - Toggle between Object and Edit mode
Shift + Tab - Toggle Snap
Shift + a - Add Menu
MMW - Zoom
MMB + Shift - Pan around
Alt + MMB-Drag - Change view plane
Shift + c - Reset 3D Cursor
Shift + s - Snap menu
Alt + d - Duplicate
z - Change object draw mode
Alt + g - Reset all locations
Alt + r - Reset all rotations
Alt + s - Reset all scales
Ctrl + a - Apply menu (Transformations)
In Edit Mode:
1 - Vertices
2 - Edges
3 - Face
In Edit-Face Mode:
e - Extrude face
i - Inset face
e + Alt - Extrude Menu
In Edit-Edge Mode:
LMB + Alt - Loop Select
LMB + Alt + Ctrl - Ring Select
In Edit-Vertex Mode:
double tap g - Slide vertex along edge
j - Join two vertices with an edge