To cater to visitors with small screenFrom statistics obtained from Statcounter, I find that 5 to 20% of my visitors are still using the small screen 800x600 resolution (Update: now 800x600 less than 2%), and these visitors will just be able to see the whole width of my blogs without having to scroll horizontally when I use Ramani's fixed width 3 column New Blogger template (Update: now using slightly wider 4 column Minima template) for my blogs. (Note: If you are viewing this blog with a large screen, and will like to know how it appear to a small screen visitor, type or copy-paste
into the address bar and press enter).
Even big websites with very knowledgeable webmaster like BBC News uses a template which take into consideration visitors with small screens. If you visit BBC News with a large screen, you will probably also see blank "wasted" space on your screen, just like this blog.
If I use other templates, visitors with small screen may be forced to scroll horizontally to see the rest of the right side of the blog if I use a fixed width wider format template, or the main column or sidebars may be squeezed into narrow columns if I use a fluid width template. Also, with a fluid width template, I have to be careful to make sure the width of images, scroll boxes, tables, etc, will fit into the narrow columns when such visitors visit my sites. Otherwise, they may find the sidebar or main column pushed to the bottom of the page or see other problems.