I see that TomDart wanted to know,

So, do you print  selected images and do you stick to conventional sizes?

In general, no.  Here on renderosity, I try to limit the image sixe to 1024 pixels wide so that the viewer will not have to scroll left-right to see the image. 

I have a print portfolio that was created in the mid 1980's and every image was cropped according to the subject ... a fallen log was short and wide, a path leading up a hill was portrait format, ...

I also saw that mbz2662 observed,

Then there are the 4/6 you print and it cuts off some of your photo because it's too big.

There is a way to get a cropped image that matches the intended paper size ... please take a look at the message thread, "Yet Another Photoshop Question".  There you'll see how to crop an image and get an exact match to the paper size. 

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Martin