Analytics Basics: Unique Visitors, New vs. Returning Visitors | ClickZ
"Absolute Unique Visitors" versus "New and Returning" - Analytics Blog
Standard Metrics Revisited: #1: Visitors - Occam's Razor by Avinash Kaushik
Hits, Page Views, Visitors and Visits Demystified - Web Analytics, Behavioral Targeting and Optimization by Anil Batra
Getting Started With Google Analytics – Training & Certification – Google Analytics
UserReport - Free surveys, click tracking & feedback for websites.
PageRank, website value review, page rank stats, keyword seo analytics
Majestic SEO : Backlink Checker & Site Explorer
Moz: Inbound Marketing and SEO Software, Made Easy
Distimo: App Analytics, Conversion Tracking, App Download & Revenue Data
SocialTimes.Me
Analytics for Marketers | SumAll
CrowdRatio :: Social Network Analysis Platform
Twitonomy: Twitter #analytics and much more...
Ahrefs - Backlinks & SERPs Research Tool
Measuring Social Media ROI & Goal Conversions with Google Analytics 5 | Unbounce
Open Site Explorer
10 Google Analytics Terms & Definitions You Need to Know
Curalate: Pinterest, Instagram Analytics & Marketing
4 Free Tools to Measure Your Instagram Success
Easy Social Media Analytics & Measurement | Simply Measured
Statigram - All Instagram online
SEMrush - service for competitors research, shows organic and Ads keywords for any site or domain
Real Time Search - Social Mention
Twitter Analytics, Twitter CRM, Twitter Tools
Powerful Tracking for Hashtags | Hashtracking.com
How Far Did Your Tweet Travel? | TweetReach
10 Little-Known Ways to See How Much Traffic a Website Gets - How To Make Money Online
The Most Important Things To Know About Google Analytics - Yahoo! Small Business Advisor
Most Important Google Analytics Reports | Superb Internet