This is based on topic in Q&A forum (http://www.sencha.com/forum/showthread.php?248297).

In "Getting Started with Sencha Touch 2" guide there's the following text:

"First, you'll need to download the free Sencha Touch 2 SDK and SDK Tools from the Sencha website."
"Sencha Touch 2 SDK" points to page with link to Sencha Touch 2.1 and "SDK Tools" link points to SDK Tools page (http://www.sencha.com/products/sdk-tools/download), not the new Cmd page (http://www.sencha.com/products/sencha-cmd/download). The guide doesn't say anything about differences between 2.0 and 2.1 - it just says "This Guide is most relevant to Sencha Touch, 2.x.". Updating the second link to point to Cmd page (and the rest of the guide accordingly) will probably save new users a lot of time and frustration