Google's Android OS goes from strength to strength, both as a smartphone and a tablet OS, throwing up alternatives to the shopping lists of new customers. In our comprehensive guide to all things Android, we'll fully examine its strengths and weaknesses. We'll rate all the best phones and tablets, and explain how to switch to them without losing your favourite apps and connections. There'll also be a rundown of the essential Android downloads, and even how to take advantage of Android's open-source structure to make money from building your own apps.