Hi there, perhaps you may consider adding this page to those others in the Cordillera Oriental range in addition to just the "Ecuador's Big 10" list? Cheers, Baarb.
To bad, but you're not allowed to climb Tungurahua at the moment (February 2010). In fact, it's illegal to do so. They've even put signs at the bottom of the volcano.
In September 2016 Tungurahua area officially reopened, there are rangers up there at the entrance and you can climb - same regulations apply as for other Ecuadorian mountains >5k. Refuge is open but nobody is there, you have to bring your own food etc. but can sleep there (mattresses) and use the stove (gas) for USD 5,-- per person.