En Search Engine Journal han hecho una buena recopilación de los mejores posts de Mashable con listados de recursos para SMO, desarrollo y diseño web, blogging y otros para usuarios de internet en general.

Estos son algunos entre los que me han parecido más interesantes:

SMO:

• Top 10 Reputation Tracking Tools Worth Paying For
• 10 of the Best Social Media Tools for PR Professionals and Journalists
• 20+ Free Press Release Distribution Sites
• 20+ Great Twitter Tools for Firefox
• SOCIAL BOOKMARKING: 50+ Social Bookmarking Sites

Desarrollo y diseño web:

• Web Design Toolbox: 130+ New Tools to Make You a Better and Faster Designer
• 6 Embeddable HTML Editors for Your Website Compared
• Web Development Toolbox: 120+ New Tools for Web Development
• 13 Free and Cheap Website Monitoring Services
• Another 16 Firefox Add-ons For Web Designers

Blogging:

• The Top 12 RSS Plugins for WordPress
• 20 of the Best SEO Plugins for WordPress
• 40+ Firefox Add-ons for High Speed Blogging

Miscelánea:

• 20+ Great Greasemonkey Scripts for Improving Your Facebook Experience
• URL Toolbox: 90+ URL Shortening Services
• Online Maps: 50+ Tools and Resources
• 90+ Online Photography Tools and Resources
• FLICKR TOOLBOX: 100+ Tools For Flickr Addicts

Fuente:
70+ Most Useful Mashable Posts for Search Marketers and Developers
70+ Most Useful Mashable Posts for Search Marketers and Developers – II