It contains a reference list of the longest instances of various things ... somewhat pointless, but fun nonetheless.
My favourite, so far, is the longest calculator word ... 53177187714 (hILLBILLIES).
Speaking of extremely long things, according to Anagrammy, some chap named Mike Keith used a computer to find an anagram for the complete text of Moby Dick, which totals 935,763 letters!