6 letters, memorable, a dot com with many possibilities. Robots are the future, and this domain is radically valuable.

Of Interest: "Robots can be placed into roughly two categories based on the type of job they do:
    * Jobs which a robot can do better than a human. Here, robots can increase productivity, accuracy, and endurance.
    * Jobs which a human could do better than a robot, but it is desirable to remove the human for some reason. Here, robots free us from dirty, dangerous and dull tasks." (Source: Wikipedia.org)

Other robotic domains available: Crobot.com, WuBot.com, ZenBot.com, HeartBot.com, ViralBot.com, SurgiBot.com, Rotobot.com I have over 100 short, quality bot dot coms.

Top level extensions only. Premium dot com, org, net and a few us, eu domains at reasonable prices.
Many 'frequently-used-letter' acronyms, tech, medical, dental, legal, nanotechnology, Internet, communications, robotics, space, biotechnology, pharmaceutical, industry, insurance, health, real estate, banking and financial, water, environment, energy, automotive, more...

Bulk sales of specific categories.