As regards a quick update on marathons I plan to explore -
Lipton Bangalore Int'l Marathon - Sept 3, 2006
The Great Tibetan Marathon - Sept 9, 2006
Hyderabad Midnight Marathon - Sept 23, 2006
Hutch Delhi Marathon - Oct 15, 2006
Standard Chartered Singapore Marathon - Dec 3, 2007
Standard Chartered Mumbai Marathon - Jan 21, 2007
I am trying to find out more on the Great Tibetan marathon, I would love to be a part in it, as it happens in Ladakh, one of the most beautiful place in India. And this would be an amazing opportunity to visit the place, the only problem (big one) would be getting used to the altitude! I might do a half marathon or something, but would need more details on how long it would take me to acclimatize to the altitude and other relevant details.
Do visit the site, its one of the most beautiful places on earth...