All fixed now! 
In addition to comments and my other tests, all the side items apart from Author now use the script.aculo.us’ Ajax.Updater to import a file dynamically and display it when you click on the + to expand. Sadly this doesnt seem to be consistent. In my tests on my PowerBook last night, it worked in Safari but not in Firefox, whereas now on my work G5 its working in Firefox 
(and its stopped again)
In other tests on the Mac this morning its not working in Opera, OmniWeb or Camino (Err, now it works). In my Windows test, it doesnt work in Internet Explorer (no biggie as I stopped supporting IE ages ago despite 59% of my visitors using it according to google) or Firefox.
To be clear about what is and isnt working, the divs (or ols actually) show and hide, but it doesnt seem to load the page. This is very odd as Ive even saved the source from the rendered page, tested that and it works fine.
Actually, Im tempted to just going back to showing and hiding the ols. My reasons for dynamically loading the ols where that firstly it would save bandwidth as you only have to load what you want to see and secondly so that your seeing the latest state of the site, but to be honest, I dont think I get enough hits for that to be a valid reason.
Still, i would like to get it to work as itll be a useful ability Im sure.
So, any ideas?
Ah, got it! DOH! because Ive hardcoded the url as www.somefoolwitha.com into the page, it will only work if youre on that domain. Sans the www or sflwa.com wont work. Right stage 2.
Next stage, draggable boxes
I fixed it by changing the hardcoded URL to
new Ajax.Updater({success:'div_id'}, 'http://< ?php echo $_SERVER['HTTP_HOST'] ?>/path/to/page.php',{asynchronous:true}); I think it should work in all browsers now (watch out for the space there in < ?php). 4 hours (!) I spent yesterday trying to debug that, then I guess it today within 30 minutes!
Mobile web browsers have come a long way since we first introduced an XHTML version of Reader back in 2006. For example, iPhone and iPod Touch owners know how powerful having a full-featured browser is. We on the Reader team are heavy mobile Safari users. Sometimes we use it to kill time, other times for answering important questions that come up during brunch: What is Tyrol’s first name? How is maple butter made? How do you sweeten rhubarb for sangria? What is John Gruber saying now? For questions like the last one, we of course use Reader to keep up with our subscriptions. #
