At the risk of incurring Android fanboy wrath, Google Now is a lot like Apple's Siri: it responds to voice commands and can perform lots of cool and practical functions.
Of course, like Siri, it comes without an instruction manual. And, in fact, if you invoke the help command or look at Google's own support page, you'll get only an abbreviated list of the available voice actions.
Over at Trendblog.net, however, there's a new infographic listing around 60 Google Now voice commands, everything from Communication to Notes & Reminders to Easter Eggs...