Math Medics
S.o.s. Math: Absolute Convergence
This lesson provides a general overview of absolute convergence, complete with a summary and several examples.
Mathematics Archives
Math Archives: Visual Calculus: Absolute Convergence
A good site explaining absolute convergence. The site has the definition, theorem and examples.
Math Words
Math Words: Absolute Convergence
This MathWords.com site clearly states how to determine if a series converges absolutely.
Wolfram Research
Wolfram Math World: Absolute Convergence
This page briefly discusses absolute convergence as it relates to series. Also provides some properties of absolutely convergent series.