I recently had to add a tool which generates a variable number of output
files, and I used the HTML / output directory trick as (very concisely)
explained here: http://g2.trac.bx.psu.edu/wiki/AddingToolsFAQ
This is a very cool feature!
It took some time to get right, so I'm attaching a complete working
example for future reference (you can add it to the wiki, if you'd like).
Using an <IFRAME> inside the output HTML, I can even show the multiple
output files in the main HTML page, in a report-like way.
Thanks, and keep up the good work.