I have used XML and XSLT to present some insurance statistics. A PERL-script collects the statistical data out of the database and sends it out as XML. It then gets transformed to HTML in nice tables and graphs, sums and ratios are calculated, ... all by XSLT. I now rarely have to change the PERL-scripts and can do most of the work through the XSLT-scripts.

CountZero

"If you have four groups working on a compiler, you'll get a 4-pass compiler." - Conway's Law