I want to use some renders for a comic, and need some motion effects. One would be motion blur within Poser 7. I followed this tutorial:

http://www.cocs.com/poser/motionblur.htm

which basically is:

• Set an initial state as a keyframe in frame 1
• Set a moved state as a keyframe in frame 30
• Turn on 3D Motion Blur in render options
• Render any frame to get blur

But when I render, there is no blur. Is something missing?

Also, what other things can people suggest to show motion/movement in a poser render, even if it's post render such as an edit in Photoshop?

You have to render the frame as an animation to get the blur.
You only need a 2 frame anim to get motion blur, set the scene in frame one, then in frame 2 move the object you want blur on. Goto movie settings, enable 2d motion blur (or 3D motion blur in the main render settings), set Format as image files, set the renderer to the render option (eg, firefly, P4), then set the 2nd frame to be rendered in the time Span option (Start 2, End 2). I used the 2 frame anim technique in this pic that I did to get the background blurred, http://www.renderosity.com/mod/gallery/index.php?image_id=582306 . 

For postwork blur I would render the background, save the image. Start a new scene with the object (eg, spaceship) to be blurred, then render it with no background. Save as a .tif or .png to get the alpha channel. In your graphics program load your bg image, then load the other render, use the alpha channel to get a crisp selection of the spaceship and copy/paste onto a new layer over the background image. Then use a motion blur filter on the spaceship to get the required amount of blur.

Hoper that helps.

3D motion blur will use the motion from one frame to the next - if you're setting your beginning and end pose in frame 1 and 30, you'll end up with very minimal differences between the frames, thus barely any blur. As Raven wrote - set your start and end pose in frames 1 and 2, enable 3D motion blur in the render settings (use FireFly) and render frame #1. The quality of the motion blur is controlled with the pixel samples setting.

whats the difference between 3d motion blur and 2d motion blur?