How many websites are there in the world and how is this broken down
geographically? How many of those websites require usernames /
paswords or other forms of logins?

Number of websites.

According to Netcraft?s April 2006 survey, there are now more than 80
million websites on the internet. This report includes a graph showing
how the number of websites has grown from 1995 to April 2006.
Source: Netcraft
http://news.netcraft.com/archives/2006/04/06/april_2006_web_server_survey.html

-----------------------------
Geographical breakdown.

Number of websites per 1,000 population.
This report has a table of figures for European countries, Canada, US,
Scandinavian countries, New Zealand, Australia, Korea, Japan and
Mexico.
Source: OECD, STI Scoreboard 2003 ?Communications Outlook 2003.
http://66.249.93.104/search?q=cache:ZWrXApsva3QJ:www.stats.govt.nz/NR/rdonlyres/19EEB840-D100-4394-BF39-E502FC9CD18C/0/ComputersandtheInternetGraphofWebsitesbycountry.xls+%22number+of+websites%22+%22by+country%22&hl=nl&gl=be&ct=clnk&cd=5

Number of websites for Turkey, Argentina, Mexico and Brazil in 2004.
Source: Internet Software Consortium.
http://72.14.207.104/search?q=cache:voZh06ZvnX8J:www.diplomacy.edu/ig/research/IGRP-AlternativeEconomicModelsI.pdf++oecd+2005+communications+outlook+%22number+of+websites%22&hl=nl&ct=clnk&cd=8

Figures for Europe.
UK: 1635678 
Germany: 1512622 
France: 715570 
Italy: 372153 
Spain: 329572 
Netherlands: 261752 
Switzerland: 212205 
Sweden: 166869 
Denmark: 99477 
Norway: 97860 
Austria: 66719 
Finland: 45088 
Belgium: 45076 
Portugal: 15912 
Greece: 5432 
Luxembourg: 2664 
Iceland: 1359 
Source: jmccormac
http://www.webmasterworld.com/forum18/606-1-10.htm

------------------------------------------
Number of sites requiring log-in, registration, user name, password.

This survey found that 65% of websites asked for a user name and address.
Source: Current Research: Value exchange: The secret of building
customer relationships on line
http://www.datainformationservices.com/sa/forum/topic.asp?TOPIC_ID=26

More than 50% of online local newspapers require users to register.
Source: Registration? For What?
http://www.pcmag.com/article2/0,1759,1646213,00.asp

A survey of 751 popular EU and US based sites found that 75% ask for
some sort or personal information from users.
Source: EU and US web sites fail basic privacy standards
http://www.out-law.com/page-1342

48% of online pharmacies ask for a user name and password to be registered.
Source: Surfing, self-medicating and safety: buying non-prescription
and complementary medicines via the internet
http://qhc.bmjjournals.com/cgi/content/full/12/2/88

In 2004, 25% of online catalog companies require users to register,
for the other 75% registration was optional.
Source: Catalog Age. Eighth Annual Electronic Marketing Survey.
http://multichannelmerchant.com/news/marketing_electronic_marketing_survey/index.html

In 1999, 16% of catalog companies required users to register before purchasing.
Source: Catalog Age.
http://www.clickz.com/stats/sectors/retailing/article.php/6061_153491

75% of users have left a site because it requires user registration.
Source: Should Your Site Require Registration? By Corey Rudl 
http://www.entrepreneur.com/article/0,4621,311674,00.html>


<Search strategy :>

<worldwide "million websites" 2006>
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<"number of websites" "by country">
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<"websites were surveyed" password>
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<websites "required users to register" percent>
<://www.google.com/search?hl=nl&rls=GGLG%2CGGLG%3A2006-12%2CGGLG%3Aen&as_qdr=all&q=websites+%22required+users+to+register%22+percent&lr=>

<Hope this helps.>

Great thank you.