Under the Scope heading under Introduction (in tutorial.md), the "language reference" link leads to rust.html instead of rust.md. It's a relative link, but I would suggest changing it to .md and redirecting on the actual site.

The note about the Sublime Text 2 is in the tutorial.md file, but it's missing from the main site.

http://doc.rust-lang.org/doc/tutorial.html seems to describe Rust 0.4 while everything else seems to describe 0.3.

The links in rust.md and on http://dl.rust-lang.org/doc/rust.html to the core library and standard library are broken.

I'll comment if I discover more.