This site is managed by Wordpress, an open source weblog publishing system, along with a slew of plugins. WordPress is distributed under the GNU General Public License and is available free of charge.
The Portable Learner keeps a squinty eye on the W3C technical reports and recommendations. For this reason, she makes use of Thematic, a sophisticated, extensible, semantic WordPress framework theme by Ian Stewart that is also available free of charge and open source. She wraps the remaining bits with plain old semantic HTML and styles with CSS. Microformats such as hAtom, XFN, hCard and rel-tag abound. On most days when the sun shines, this site validates as XHTML 1.0 Strict. This means it should perform equally well in all modern browsers and on all platforms. If you do experience problems, however, do take a moment to let me know, and I’ll do what I can.
I should add, if you have an older browser, some features might not work. Even Internet Explorer 6 is out of date, as it doesn’t support the full set of W3C standards. Consider using a browser that does conform to web standards. My preference is the Firefox browser.
Depending on your platform, Baskerville or Palatino Linotype are used for headers and incidental text, Georgia for the body. The text size on this site is completely under your control, as it should be. You can adjust the sizing through your browser menu View » Text Size menu.
The photos that aren’t mine have been made available under a Creative Commons license, a tool that lets artists share their creative works with the freedoms they want it to carry. Whenever possible, I provide photo credits.
The icons that aren’t mine are part of the Silk Icons set created by Mark James.
Audio files of each post are available via Talkr, a service that provides podcasts of text-only blogs.
Finally, I keep a pictorial history of this site to remind myself how central this site is to my own learning. Opinions, suggestions for improvement, or inquiries about this site are always welcome.
Photo credits: Spinney the tin robot, from General Robots.

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