From Headus Docs

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Mastering UVLayout : Comprehensive Tips and Tricks from the Author

Fig 1. Design

Fig 2. Reality

The Core Mechanic 

Knowing whats going on behind the GUI can only help. Rubber toy demo.

Cutting 

There's more than one way to skin a cat (apologies to cat lovers). It doesn't have to be perfect first time. Cut, flatten, see how it goes, then adjust seams by detaching and welding.

Geometry to UVs 

The relationship between the flattened shapes and UV coordinates, and how that impacts on other tools such as scaling and packing.

Kinks

What they are, why the occur, how to get rid of them.

Ctrl-Shift MMB drag

Shift MMB drag

Shift B

Edit -> Settings -> F1 / Run For

Green Balance

Where you need to use it.

select already flattened, click green balance

select rest, rescale U & V

Advanced Packing

Eg wrapping

Subdivision Surfaces

Why they need special handling.

Obscure Tools

Niche usage, but handy to keep in mind. Reshape (eg Phileroo), Camera scaling.

Pattern Making

Costume. (see Fig 2). Tip: Use Segment tool.

Easter Eggs & Under Development

Shift-J, F9, UV Sets