Some Palm Pres Exhibiting Screen Distortion
It should be noted that Apple has had issues with past versions of the iPhone as well, ranging from cracking cases to its own screen complaints. So don't slam Palm yet. On the other hand, there are also reports of crashes (but realistically, it's all software).
Here's a thread at PreCentral, and one at EverythingPre. Apparently, Sprint stores are (if they have stock, good luck on that) replacing the units with new ones. Some "distortions" or blotches are more evident than others.
Ah, the perils of being an early adopter. We'll see if this becomes a widespread issue or not.