You can get Touch.Salesforce.com activated in your orgs by sending a request via the Help menu in Salesforce. Simple send a feature activation case request through the self service portal and Salesforce will enable it.
I've been playing around with it and its pretty slick. As with most people, I'm chomping at the bit for the edit functionality, as well as the offline functionality. Currently in the public beta you can only add Tasks and Chatter Posts. Hoping when they go GA out of Beta that it will be enabled.
One thing to note is you must have Chatter enabled. Sorry Chatter haters, but if you want to roll with touch you'll need to enable it and embrace the future. ;)
