We unboxed our PSP Brite to test some games and see if we encountered the same problem. Sure enough, in both FMV and gameplay, there is a noticable offset between the two video fields comprising the on-screen image. The included Ratchet & Clank: Size Matters looks significantly more "pixelated" on the PSP-3000 versus on our PSP-2000, as did other games we tested, including God of War: Chains of Olympus and WipEout Pulse. Additionally, scanlines are visible simply when navigating the unit's XMB.
The problem is slightly less noticable when the new Wide Color Space option is turned off. We contacted SCEA for comment on this apparent hardware issue and were told that the company is "looking into this" and will get back to us as soon as possible. We'll update this post when we hear more. In the meantime, let us know in comments if you're experiencing similar issues with the PSP Brite.