A group of friends and I play Foosball, aka Table Football. We record the results and compute ELO rankings to see how we're doing.
The rankings are computed from a XML results file using JavaScript and then displayed using Scalar Vector Graphics (SVG). The page is interactive in that group stats (as shown in the screenshot) or pair-wise stats can be displayed, and one may also display curves for global averages (wins, losses, etc) as well as the rankings. A fairly recent standards compliant browser is required for the interactive Dynamic XHTML page to work correctly. I've been using Firefox, and I suspect anything recent other than Internet Explorer to work fine.
Here is a screenshot for browsers lacking the required features: