Portfolio from Extensis cannot even dispaly 16bit pictures saved in Photoshop...
Strange. I have current versions of Portfolio and Photoshop, and I work entirely in 16-bit photoshop images for post-processing, and Portfolio displays them just fine.
It is cumbersome in other ways, though. I am waiting to see whether version 8, due out next month, will address some of its ugly and un-ergonomic interface issues, and its problems handling metadata--specifically, inability to reliably read xmp metadata (accompanying nikon .nef files) entered in Bridge, or conversely to write xmp metadata that Bridge can read. If these are fixed, I might upgrade ($99 for me, atop my purchases of v.6 and v.7!)
I looked at iView Media Pro 3, released only a couple of weeks ago. It has some nice features, but as I understand it, it won't handle xmp metadata any better than Portfolio 7. If someone here knows otherwise, please correct me.
I'm also intrigued by Aperture, and I can get it for an academic price of $249 due to my university connection. Problem I understand there is that it can only view flattened .psd's. Layered .psd's are a frequent part of my workflow, so this would be an impediment. Again, please set me straight.