[Saphire]

Snowyowl, when you double click on the thumbnail it opens up another window with the thumbnails at the top eg. below. As long as you don't put your curser in the main window the thumbnails stay put, just press on each photo along the top line and it will show the large photo in the main window. When you want to compare like photos to see if they are sharp. Hold down the ctrl and pick upto 4 thumbnails then press on the box in-between the rotate tool and the envelope, this will put the 4 photos on the screen, you can zoom and delete any you don't want.
The other programs are also good I use the screen capture, the photo below was done with it. You can use it for save as, email, clipboard and a couple of others.
Maxview is a simple program for viewing your photos at full size it will even read Canon Raw and I think Nikon.

The photo resizer is also a batch covert and rename tool for standard Jpeg, Tiff, Gif etc but not raw files.

Hope this helps.