The Brits this year introduced a decathlon competition, see
www.britishswimming.org/.../0,10853,5157-183850-201068-nav-list,00.html
The event is based on an age adjusted scoring system. Total score is based on points from up to 10 events, up to 2 each taken from 6 groups: 4 strokes 50-200, distance free and IM.
Scottish swimming has been doing this for a while.
www.scottishswimming.com/downloads.aspx
Do any of the regions of USMS do something similar? Is there interest in introducing a USMS decathlon?
(Leonard Jansen started a thread on this in 2003)