Chrome SEO
The Google Chrome SEO Extension provides easy access to Search Engine Optimization Tools that can help you with Competitive Analysis, Keyword Research, Backlink Checks, PageRank Checks and other daily SEO tasks.

SoMuch.com
Popular Internet Links directory focused mainly on Computers and Programming but also covers humor, entertainment, news, Medical, Real Estate and Property, Travel, Timeshare and Cruises, Fitness and Bodybuilding, Music and Graphics. Links are updated daily.

MarketingExperiments.com
This site is one of my Top Secret favorite sites I go to for the the cutting edge in SEO research.

TimeLeft
This tool is awesome.  Add multiple types of timers and time tracking windows to your desktop.  They even have a deluxe version that lets you go nuts with it.