You no longer have to cajole your friends into giving you an invite to Google's smarter, task-oriented Inbox app. As of today, it's available to everyone with a standard Gmail account -- you just have to grab the Android or iOS app, and you're off to the races. There are a few new features coming along for the ride, too. Inbox now bundles all your trip-related email in one place, and will both show your Google Keep reminders and suggest adding them if someone sends you a to-do list. You also get options to take back outgoing emails, add custom signatures and open reservations directly in apps like Eat24 or HotelTonight. Workers who need Google Apps support won't get to use the normal Inbox app just yet, but Google is opening the early adopter program to anyone who wants to get in.