[Artmessiah]

I don't know if this one has been mentioned, but there is an image browser similar to Adobe Bridge that can create thumbnails for .ORA (within the browser).  It's Called XnView, it's free and it's great.  It has a lot of plugins to add to the program to make it even better (like slide videos, riot plugin, etc).  

Get the program; Here

and get the ORA plugin; Here