The Truman Library provides an excellent collection of primary sources from the Truman Presidency.

CNN has built a very interesting, if a bit navigationally fussy, website on the Cold War Experience, which provides excellent insight into the cultural ramifications of the Cold War.

History Matters provides the full text of Senator Joseph McCarthy's career-making 1950 speech at Wheeling, West Virginia, which propelled him to national fame as the most bombastic practitioner of the anticommunist tactics which came to bear his name.