While I didn't stick *quite* to the current perlmonks style, the important part is under the hood. Do a view source on each page, or simply direct your browser to http://www.geocities.com/howars.geo/perlmonks/ to grab things (including the css file) right out of the directory.
I tested in IE5, IE6, Mozilla 0.9.7, lynx all with good results. I didn't get around to quite everthing, such as how <code> tags are currently rendered, but the majority of site markup is done (I think).
When you open the source you'll notice that just about everything is named, either by class or by id. This should make it much easier to refer to style the different conceptual containers on the page (as belg4mit brought up in the thread under Petruchio's node). I also ordered the page elements in the source code as I thought would make sense to someone using a text/voice browser as opposed to a visual one.
I've only done three pages, but I'd be quite willing to work with the pmdev team to get the site's markup up-to-date.
feedback craved :)