So I like using my Ubuntu install. One thing that bothered me was that with the default F-Spot photo manager, I could not for the life of me find a way to resize my pictures. So I removed F-Spot and went with Shotwell. The same, there is a button to Crop but no Resize.
What I like about 10.04 LTS is that GIMP wasn't installed by default. I use a netbook and I feel that it may not be able to cope with the resources needed for GIMP. But I felt that installing GIMP was the next move. I searched Google and came across the article below (mentioned as a Reference).
So what's the fastest, most convenient and most user-friendly way to resize photos? Right-click the picture and on the drop-down menu select "Resize Images..." (read: it can process multiple pictures). It's called the Nautilus Image Converter and it resides in the context menu. Obviously, you will need Nautilus to be your file manager.