Poland in the 1980s was filled with shuttered restaurants and shops that bore such imaginative names as "bread," "shoes," and "milk products," from which lines could stretch for days on the mere rumor there was something worth buying. But you'd be hard-pressed to recognize the same squares--buzzing with bars and cafes--today. In the years since the collapse of communism, Poland's GDP has almost tripled, making it the eighth-largest economy in the European Union, with a wealth of well-educated and highly skilled workers and a buoyant private sector that competes in international markets. Many...