Pushbullet is all growed up (Rugrats reference). You can tell by the fact that it has somewhat outgrown the original simple goal it had when it started. Yes, of course, you still push things, but the definition of "things" has expanded considerably, encompassing not just files and links but also notifications and SMS. The latest update takes that last one even further. Now Pushbullet can let you send SMS right from the comforts of your computer. Via its browser extension, of course.