Hub Finder - looks for sites which have co occuring links to related authoritative websites on a particular topic.
Bad Neighbourhood Checker - scans the links on your website, and on the pages that your website is linking to, and flag possible problem areas.
Link Diagnosis -show you all the important information about your competitor's links. The report includes pagerank, anchor texts, no-follow information and more.
Web Spam Detector - take a quick look for potential flags a web page may have.
Link Valet - analyzes both internal and external links for a given webpage.
Backlink Builder - searches for websites of the theme you specify that contain keyphrases like "Add link", "Add site", "Add URL", "Add URL", "Submit URL", "Add Article" etc.
Advanced Google search tool a tool from Liam that uses search oprtators from Google to create a complex search that can be useful for finding link locales. Knowledge of Google Hacks is helpful.
Backlink Analyzer - another great tool from Aaron Wall (free download)
Taffic Marks - a web-based SEO app that identifies so-called hub sites that usually rank in at least 3 of the top 10 ranking sites for your given keyword.
Yahoo site explorer file parser - this tool is handy for getting a concise list of linking sites from the Yahoo TSF file export.
Backlink Watch - complete detailed information about quality and quantity of backlinks pointing to your website.
Majestic SEO Index tools - Anchor Index is a system designed for research of relevancy algorithms that are heavily based on backlinks and anchor text. This index is currently under heavy development, so consider this interface being a beta version that can change or go down at any time.
Directories; TriFecta Tool list of Directories | SEO Friendly Directories and Directory Critic - Niche directories - More Niche Directories - List of Paid Directories - Hub Finder - Directory Rate -
Article Submissions; Article Directories and Niche distribution Article Submission Services - Article Marketer |
Blogs - always a good way to do SMM and Link building at the same time as stayin in tune; Blog Hub | Technorati | MyBlogLog | Blog Catalog | Google Blog Search | Blog Juice Analysis
Social Media - Big List of Social media - Here on the trail