The first logo prototype. Literally created with a TrackPoint, while sitting in a hotel room in Boston in early 2011, and it shows. (The terrible TrackPoint art that is. I don't think you could deduce the Boston part from the image itself.)
The first real attempt. Originally drawn on a Wacom tablet, outline only. The raptor outline was cleaned up by hand and simplified, and is more or less what you know and love today. However, somewhere along the way I lost the path info for the bomb and was unable to simplify it, so it looks a lot worse than the raptor overall.
The current generation, with all the bells, whistles, and colors. I redid the bomb completely, with curved vectors replacing the original hand-drawn lines. (Science!)
The logos (whether in SVG or compiled PNG form) are available under a Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) license.