In reply to Kev Wynne:
Another important point. A lock off for someone of 6ft could be a dyno for someone of 5ft 6. So some boulder problems will either include a dyno or not depending on your height.
As for dyno's I don't see why a grade can't be attached to them. Being tall is not always an advantage, some of the best people at dyno's are short.
Imagine, for example the problem 'Brad Pit' if it didn't have the sidepulls. This would be a dyno and one where being tall would not help a great deal. It has actually been suggested as font 8a like this as opposed to it's actual grade of 7c using everything.