Is Google a One-Trick Pony?

Many people have labeled Google a "one-trick pony" despite its many varied efforts to launch innovative new businesses. Much has been made lately of their efforts to challenge Microsoft on a variety of fronts, but this article suggests that it's been a tough slog in the application software business. One has to wonder whether Google may lose focus at some point as it pursues so many different avenues of new growth beyond its search advertising juggernaut. How can it keep so many balls in the air, and do them all highly effectively?