Rust's primary documentation, including the tutorial, guides and manual, are on the Rust website. The wiki is mostly used for in-progress documentation or somewhat random pieces of advice/hints, as well as fast-evolving community maintained lists.
Additional supplementary documentation is maintained here on the wiki.
Rust for C++ programmers - A cheat sheet
Rust for Rubyists - Excellent introduction to Rust
Rust by Example - Comprehensive examples
More examples - Where to look for examples of Rust
Rusticon - A glossary of terms commonly used in Rust and Rust tools.
Releases - Links to current and old releases and documentation
Detailed release notes - Further explanation of language changes
Community libraries - A curated list of external libraries for Rust
The Periodic Table of Rust Types
Computer Graphics and Game Development - Libraries and example projects
UVA Rust tutorial
getting Rust working on other platforms
Présentation du langage Rust - Detailed documentation in French, with examples
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There is a steady stream of broadcast presentations on Air Mozilla.
Here are some collected presentations for other locations: