Ken Halla. The Constitution Center's website features the U.S. Constitution divided into easily searchable sections. From the main page you can select and jump to a specific article or amendment. What I really like about the site is that you can choose an issue like privacy, civil rights, or health care and see how those issues are connected to the Constitution.
Applications for Education
The Constitution Center offers an extensive list of lesson plans for each of the Constitution's articles and amendments. Select an article or amendment then scroll to the bottom of the page to find the lesson plans. Alternatively, you can find all of the lesson plans listed here.
If you find this resource useful, consider participating in the course Teaching History on the Web that Ken and I will be teaching later this month.