There is syntax highlighting for Vim, Emacs, and Sublime Text editors. GitHub does syntax highlighting for Rust repos and in Gists. There is support for Rust in the Pygments syntax highlighting library (which is used by a bunch of tools). Several community members have worked on IDE support for various IDEs (e.g., http://plugins.jetbrains.com/plugin/7438). Post-1.0 (i.e., next year) we plan to really focus on excellent tool support, so expect lots of cool stuff then.
