Again, the text of each image can be found in the image element's alt attribute. Since WA already uses images to make formulas easier to print out, I guess Wolfram simply wanted to reuse the code.
http://www.google.com/search?q=site:wolframalpha.com+inurl:i...
The "meaning of life" and "the ultimate answer" questions feature highly. But even more people seem curious about "unemployment rate in USA".
The answers are not in Google's summary.