There is an even easier place to find a tutorial for this, in the online documentation of Maya:

Help -> Tutorials

Instant Maya->Tutorials->Rendering->Lesson 2 Shading surfaces

It has a...

Just thought I'd share another way to move / scale the image planes.

After you create the Imageplane
- Select it (View->Image Plane->Image Plane Attributes).
- Open the Channel Box if its not...

Digital Fusion is also pretty good, with support for Maya file formats:

http://www.aliaswavefront.com/en/conductors/plugins/eyeondigitalfusion.shtml

Ahh, thanks. I was trying to move it while attached to the camera and then it jumped back when switching back to fixed. I'll try your workaround next =).

Rat 5.5 doesn't work with Maya - the plugins fail to load with an error saying its an incorrect version of the API.

You can however have both Maya 4.5 and Maya 5.0 installed in different...

Is there an easy way to align / position / size reference images displayed in the viewport?

The documentation states that Image Planes should be used for displaying reference images as backgrounds...