Variable Width Planet
You asked, and I deliver. I made an alternative stylesheet for Planet KDE with variable width. View -> Use Stylesheet -> Variable Width. My HTML foo is weak so it has mysterious gaps at below the header and above the footer for no reason I can see, plus the top and bottom shadow effects are semi-transparent and overlap in ways I wouldn't want. But it should be good enough for those wanting something that fits on an N810 screen.
Here's some pictures to keep you amused.
Edinburgh Old Observatory, Calton Hill West Register House, Edinburgh, National Archives of Scotland. Every Scot for ever born in this picture. Rows from bottom: births, deaths, marrages, historic parish records (pre-1850s). The Forth Bridge Me jumping off the Forth Bridge