Any do it? To be honest I've always thought it was for the oldies but I reckon you could get some wicked events going. Mountain biking, paddle, climb etc
Would be very interested to see a more physical version of it if its around? (No not tackling people mid race 
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Yeah I've been doing the normal 15km run type orienteering for a while now and it is a bit easy
NOT
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GPS & geocacheing has put cunning running back with the Biathlon. I fondly remember doing it back in the 70's in Lane Cove River park - Having found an obscure mark, one of our team would sit on it - When the othe plonkers showed up looking for it, we would say "we can't find it either...." 
Poods 
I say if it's done with a bombed out 4wd, driving like your on steriods and your car is treated like a women with rabbies then orientating around a course full of deep ruts and insane hill climbs is hell fun.
If it ain't got an engine it ain't fun, O and wind is a form of an engine.
For all you punchuation and grammer specialist ------ bite me......
I've been mountain bike orienteering, wicked fun, had the best time (and was soundly beaten by the oldies 
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I recall representing the Army in inter-service orienteering, seems that both the Air farce and Navy could read maps better than the Army, Doh!
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There's a bunch called the hash house harriers who did exactly what you're describing.
en.wikipedia.org/wiki/Hash_House_Harriers
www.hhh.asn.au/
The Constitution of the Hash House Harriers is recorded on a club registration card dated 1950:
* To promote physical fitness among our members
* To get rid of weekend hangovers
* To acquire a good thirst and to satisfy it in beer
* To persuade the older members that they are not as old as they feel
Members often describe their group as "a drinking club with a running problem,"
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