web Formatting improvements

I’ve made some subtle and important changes to how this page looks. Posts actually typed by me, like this one and the book list one below, will now be offset by a lighter background, so they stand out. Spacing between posts is more even. And Twitter and Last.fm posts no longer contain duplicate information (well, they do, but it’s invisible).

Vastly neater, yes? I actually had to edit some PHP to do this stuff, not just CSS. I’m pleased with myself!