Using the template "Minima" a lot of space on the monitor is lost. The very short lines are not good to read.
Finally today I managed to change the width of the posting part. I like it better this way. Hopefully my readers do so too.
Dashboard → Template → Edit HTML
→ change outer wrapper width from 660 to 880 pixel
→ change main wrapper width from 410 to 610 pixel
Get more space for the actual blogging area
→ change outer wrapper width to 990 pixel (done 2009-05-05)