Thanks for your PDFCreator. Simple and powerful (although I had to deselect installation of two toolbars …).
One can not view and thus not comment on the newest blogpost but only read it on the blog page or RSS feed.
Having searched for a / the feed, I suggest you add the feed not only as a linked icon on the website but also add it to the pages metadata. (automated reading & notification of a vailable feeds …)
Another suggestion (why I even registered):
I don’t know about your hosting details, you only mentioned Apache httpd as your webserver;
Do you cache?
Did you think about switching to a faster webserver? Like Cherokee, or Nginx, or Lighttp?
Cherokee has file-cache built in, especially good for static file serving. You having named the high number of update.txt requests, this should definitely improve webserver performance.
You may also want to add Expires headers to static resources to enable (more used / longer) client caching.