Michael Hart, the Project Gutemberg founder, said in his speech at the sixth HOPE conference (Hackers On the Planet Earth) the size of the project doubles every 18 months.
The Project Gutemberg was founded 35 years ago and it lodges over 18000 free (as in freedom) electronic books in accesible text and hipertext formats. Its good health is a good new for the humanity, more in this copyrighted and DRMed age.
The full article in Homeland Stupidity by Michael Hampton.
I seize the opportunity to remember the actual inventor of the press was the Chinese 畢昇 Bi Sheng four centuries before Gutemberg 