Math2
Math2.org: Series Convergence Tests
This is an excellent resource! It states all of the most common tests for series convergence. Examples are not included.
Wolfram Research
Wolfram Math World: Root Test
This site provides a brief overview of the root test, complete with a formula and understanding the results.
Math2
Math2.org: Series Expansions
A thorough review of calculus series. Links direct the student to the basic properties of series, as well as to explanations and examples of convergence tests in series. The expansions for exponential, logarithmic, and root functions and...
Math Words
Math Words: Root Test
Math Word briefly states the root test and discusses when the series is convergent, divergent or does not exist.
Other
Seton Hall University: Root Test
This lesson, which is provided for by the Seton Hall University, gives a detailed overview of the root test, complete with a full explanation, proof, and several examples.
Wolfram Research
Wolfram Math World: Convergence Tests
This page provides links to information about tests to determine the convergence or divergence of a series. No information about convergence tests is offered directly at this link.
Other
Shippensburg University: The Root Test
This site provides a brief overview of the root test, presenting one sequence with converges absolutely and one which diverges.