I've not paid much attention to digital photo frames. The ones I've seen in stores looked pretty crummy.
Then I read in Macintouch that Ceiva has produced an iPhoto plug-in. That's a step above the pack.
It's about $180 for a 7" CEIVA.
There's no CEIVA on my acquisition list yet, but I'll keep one eye open. The CEIVA still has to pass the four tests of acquisition.