Designing a LEGO spaceship
This extremely comprehensive document is a boon when you want to get started building LEGO spaceships. Clocking in at 18 pages with a lot of examples, Péter guides you through shapes, colors, frames and details on spaceships big and small. An impressive feat, especially considering it's easy for less experienced builders to understand too.
A highly recommended read for anyone looking to build a sci-fi. Speaking as someone who has been building for more than ten years, I still learned much.