On the signature of mine you mean? I did use many motions ye. I used radial blur many times for the zoom effect. 
I remember now. I used radial blur -> zoom on the explosion (made the explosion by myself too btw).
Used motion blur on XL. And used gaussian blur on the character.
It's not difficult to make such a effects. Just do some tutorials and you will know these things automatically. If you need tutorial sites just look at the start post. There are some good sites from witch I mainly learned all the things that I do in Photoshop.
Good luck!
I remember now. I used radial blur -> zoom on the explosion (made the explosion by myself too btw).
Used motion blur on XL. And used gaussian blur on the character.
It's not difficult to make such a effects. Just do some tutorials and you will know these things automatically. If you need tutorial sites just look at the start post. There are some good sites from witch I mainly learned all the things that I do in Photoshop.
Good luck!