For documentation at work I take numerous screenshots of the different iOS apps we use.
In an attempt to organize these screenshots easily in iPhoto, I came across these two Smart Album configurations that might be helpful to others.
For iPad match all of the following conditions:
- Aperture is Unknown
- ISO is Unknown
- Filename starts with IMG_
- Filename contains PNG
- Any Text contains 1024
For iPhone (or iPod Touch) match all of the following conditions:
- Aperture is Unknown
- ISO is Unknown
- Filename starts with IMG_
- Filename contains PNG
- Any Text contains 960 (or 480 if it's a non-retina display)
[crarko adds: This seems to work as described with my 1st-gen iPad and iPhoto 9.2.1.]

