The download page suggests you should use "S60 3rd Edition FP2 without accelerometer, or S60 3rd Edition FP1" with the E66 but I recommend "S60 5th Edition, or S60 3rd Edition FP2 with accelerometer" as it works perfectly and adds accelerometer support for autorotate (also working perfectly).

The app is pretty slow to run until thumbnails are created, especially if you have a large number of images but be patient and you will find it improves dramatically once thumbnail caching is complete.

While limited in features at this point this looks to be an excellent photo viewer emerging from Nokia. I will be using this as my default viewer from now on.

Thanks,

Spikeless