K. Wilhelm Freiherr von Humboldt (1767-1835): Biography from the Acton Institute
Liberal Thinkers: Wilhelm von Humboldt: A short biography from the site of Liberal International.
On the Structural Variety of Human Language: Excerpt with introduction from Wilhelm von Humboldt's monograph, appearing as chapter six of Lehmann's `A Reader in Nineteenth Century Historical Indo-European Linguistics'.
The Sphere and Duties of Government (The Limits of State Action): Humboldt's book on political philosophy examining the tasks of the state.
Wilhelm von Humboldt: Brief eulogy with picture at Humboldt University's website.
Wilhelm von Humboldt (1767-1835): A biography.
Wilhelm von Humboldt Quotes: Short list of quotations at BrainyQuote.com.