lol jchet.
the training bible has information for both, or did last i knew - versions update a lot. a lot of the same training philosophy holds for mountain and road, though for mountain there is an obvious need on concentrate on short-term power output and bike handling more.
course, races aren't exactly the most technical courses in the world, generally, so fancy handling skills are probably less important than the average rider thinks for racing ... but then again, the ability to get through technical sections with just a fraction less energy expended than your competition means a lot in a two hour race.