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How much this site is used (as of Dec 2012)

How many "Fundamentals of Compressible Flow" book was download
We have reached over 0.5 million downloads of the "Fundamentals of Compressible Flow Mechanics" book from over 170 (out of 193 or so) different countries.
How many "Fundamentals of Die Casting Design" book were download?
We have reached over 300,000 downloads of "Fundamentals of Die Casting Design" from over 100 different countries.

Perhaps one of the indication is the external websites which are tracking this information. For example, about 2-3% users come from e-booksdirectory website which shows as of November 4th, 2012, 16,279 downloads. According to this website and assuming that about 5% are from e-booksdirectory then total downloads estimated to be 325,580.
How many "Basics of Fluid Mechanics" book were download?
We have reached over 1.2 downloads of "Basics of Fluid Mechanics" uncounted different countries. The average book download per day is over 1,000 copies.
  October 2012 statistics
The daily usage for October 2012 is below:
Oct daily usage 2012
  What is the typical usage per month (2008)?
The daily usage in a heavy month is below:
Nov daily usage 2008
The daily usage in a regular month like April is below:
April daily usage 2007
The daily usage in a slow month like January is below:
daily usage 2007

About Potto Project

Potto Project NFP is Non-Profit organization created by Dr. Genick Bar-Meir and friends to build open sourcesoftware and open content textbooks for college students.Over 1,000,000 (million) Potto Project books have been downloaded from 175 different countries since 1995.

Potto Project is under open content licenses, which means that you will always have the freedom to use it, make copies, and improve it. You are encouraged to make use of these freedoms and share the textbooks and program with your family and friends!

Copyright (C) 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003 Dr. Genick Bar-Meir.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or later or Potto license.
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This material is Open Knowledge