Browser News: Stats
Browser usage statistics from the major sites and some analysis.
http://www.upsdell.com/BrowserNews/stat.htm

Cooperative Association for Internet Data Analysis
CAIDA collects, monitors, analyzes, and visualizes several forms of Internet traffic data concerning network topology, workload characterization, performance, routing, and multicast behavior.
http://www.caida.org/

Zooknic Internet Geography Project
Data, maps and analysis on the geographic distribution of Internet domain names by city, region, state, and country.
http://www.zooknic.com/

Security Space
Monthly published research reports covering issues like web server market share, popularity of web sites, and web authoring tools.
https://secure1.securityspace.com/s_survey/data/

Major Internet Backbone MAPs
Maps of Internet backbones, sorted by market share.
http://navigators.com/isp.html

Netvalley
IT history, reports, statistics and ranks.
http://www.netvalley.com/

Internet Domain Survey
Attempts to discover every host on the Internet by doing a complete search of the Domain Name System. Statistics available for free and commercially.
http://www.isc.org/ds/

NEC Study
Predicts competition and diversity on the web.
http://modelingtheweb.com/

Internet Demographics Directory
Directory of Internet demographics, user surveys, backbone/ISP reviews and Internet topology. Entries categorised and ranked.
http://internet-demographics.netfirms.com/

Internet World Stats
Internet usage data for 233 countries and regions, consolidated from various periodic surveys.
http://www.internetworldstats.com

StatMetrix
Subscription service that provides monthly research reports and newsletters for global web activity, search engine use, web browser market share, operating systems, connection speeds, and mobile web trends.
http://www.statmetrix.com

Children Go Online: Emerging Opportunities and Dangers
Academic survey on the Internet use of children in the UK.
http://www.children-go-online.net/

WebHosting.Info
Provides statistics and research data about the Web services industry. Tracks over 35,000 Web hosting companies worldwide.
http://www.webhosting.info/

ICT statistics
Statistics extracted from the ITU World Telecommunication Indicators Database, concerning the spread of information and communication technologies in over 200 economies worldwide
http://www.itu.int/ITU-D/ict/statistics/

Internet Mapping Project: Map gallery
Contains graphical representations of the Internet. Looks like star maps, but with websites grouped by ISP.
http://research.lumeta.com/ches/map/gallery/

Internet Use(rs): Demography and Geography of the Internet
Academic paper from 2003 analysing the geography and demography of the Internet. By Dr Albert Benschop of the University of Amsterdam.
http://www.sociosite.org/demography.php

Nielsen//NetRatings
Information on Website usage, internet access, and advertising data.
http://www.netratings.com/