System Architecture

Been showing my son about downloading music. He thinks you get get it all for free, but one look at this site convinced him otherwise:

Kazaa

Maybe can use this as a source for ideas for an error handling pattern
ONJava.com: Best Practices for Exception Handling [Nov. 19, 2003]

This seems to be a nice example of the pipe and filer architecture style.

ONJava.com: Two Servlet Filters Every Web Application Should Have [Nov. 19, 2003]