A 30 MB demo for Amanita Design's Machinarium is now available to download from FilePlanet (or DemoNews.de if you are not a FilePlanet subscriber).

The full version will be available to purchase from the official site, Direct2Drive ($5 discount), Impulse, Steam and GamersGate this coming October 16th. (source)

Machinarium Soundtrack Preview (Amanita Design)
Machinarium Demo (Big Download)