Go to the Lighting menu, then uncheck “Two Sided Lighting”. Every face with reversed normals will appear black.

Say you want to render a character from several angles for presentation purposes, and for this you render one perspective at the time, and you have to wait for it to finish before you start the next. Instead, try to use only one camera, but store the different camera positions for each render in a keyframe. This makes the scene easier to manage with only one camera, and you can set software to render from frame 1-4, instead of rendering each perspective separately. This is both time saving and more practical, since you don’t have to monitor the rendering process.

Place profiles so their normal is orthogonal to the path and move it out on its normal axis some distance.

For much faster evaluation make your soft curves and surfaces linear then rebuild them higher, with history, and hide the linear surfaces.

To align verts it can be faster to enter values in the ‘Absolute Transform’, in the selection drop-down box,  rather than snapping to grid.

If you have verts resulting in nonmanifold geometry, just split them and remerge.

Often overlooked button on the Attribute Editor.  Need to compare values between objects? Want access at all times to an object’s attributes.  Hit the “Copy Tab” button at the bottom of the Attribute Editor and the attributes will be listed in their own floating window. 

Press “W” to enable transforms, then hold the “Shift” key and the middle mouse button to gesturally move the object along an axis. The object is constrained to the nearest axis depending on direction of movement. Works with the scale “R” transform as well.

Trying to parent a node near the top of the outliner list to one buried hundreds or even thousands of nodes below? Split your outliner window by dragging the bottom edge upwards.

After selecting an item, a quick way to locate it in the outliner among a deep heirarchy is to use the common “frame selected” command.  Do this by pressing “F” when hovering the mouse cursor over the outliner window.

Hold “Ctrl” then press the spacebar to gain maximum screen real-estate. Do the same to go back to your normal view.

Instead of right-clicking, hold “Shift” and Right-Click to get a context-dependent marking menu with all the nifty modeling/animation operations available right at the first level.