Google's just updated its search app on iOS, and in doing so it's made the voice search feature much more useful. With Google Search version 4.0, using voice becomes conversational -- you can ask follow-up questions in addition to simple queries like, "What's the weather?" Once you know it will be sunny with a high of 95 tomorrow, you can ask Google "How about this weekend?" and get more info. As Google's voice assistant competes with Apple's Siri and Microsoft's Cortana, more sophisticated, context-specific features like this are definitely important.