What Rust is it?
A while ago (sometime in August) I built a small service called What Rust is it?.
Based on what What Train is it now? is for Firefox, this small service lists the three trains of Rust: release, beta & nightly as well as their respective versions.
It's updated every day and actually checks what
Additionally it shows the (planned) date of the next release.
Similar information is available on the Rust Lang Forge.
See it live: