Hi, I just ran across this, and purchased it.
http://www.jasc.com/products/photoalbum/
It allows 2 up image comparrisons that are easy with independant zoom in and pan of each image (same short-cut keys as Photoshop). Cataloging is done with album collections and keywords that act as categories since they can be nested and selected. It is quick and simple to use. Albums and Windows Folders mirror each other. You don't have to load a directory into the database to access it. You can also do some quick fix stuff from within the program.
The only thing that stumped me at first was cataloging of-line CD's. My solution is to create a keyword (I called my CD's), then create a keyword for each CD created, nested in "CD's". It only takes a couple of clicks to attach the keyword name of the CD to all of the files on the CD.
Being able to compare 2 images side by side quickly is important to me because of showing customers thier photos from a session, it is a lot easier to weed the choices down to the best ones that way.
Other Notes: It appears that Roxio Easy CD Creator burns multiple CD's as a back-up file, You need to use Roxio to retreave the file...
Renaming is not very sophisticated, I will probably use Breezer Browser for that function. Breeze Browser also allows comparrison by opening multiple windows, but you can't zoom in or organize easily - but it is great at what it does.
Roger