This blog was getting strangled by its own fixed width. Yick. So I've just updated the layout CSS to remove the set-pixel-width sections. Unfortunately this also required mucking about with the background images (quick application of gimp and an upload to my own website). The parchment background doesn't look quite so pretty without its "slightly burnt" edges - but at least it won't repeat said edges over and over.
If I get more inspired later I'll update the layout to include the left/right edges individually. Right now I don't have the brain-space to figure out how do that in an elegant way.