Adding this kind of markup to your site is pretty easy to do.
The “rel=nofollow” HTML microformat (archive.org) is a way to mark links which might be problematic, whether they’re clearly spammy, just not checked or even just sites that I don’t really want to link to (but still want to provide a link for others to use - you know, “don’t look, but that guy’s got a giant nose (archive.org)!"). I understand that it is important for search engines to recognize these kinds of links and to treat them differently.
In the top right corner of this blog I have placed a small set of links that let you resize the text as it is displayed. It’s easy to use this script on your blog and it lets your visitors resize the text on the blog however they want it. The resizing setting is stored in a cookie, valid for one year, so when the visitor returns, they will see the site as they resized it last.