Creating Concise Technical Resumes?

Mycroft-X asks: "I was polishing my resume today, preparing to fish for another job when I realized that with all the new information I put on, it was over 3 pages long! Because our industry is so meritocratic, I included such things as skills with operating systems, programming languages and various applications (sticking to major ones only). How do you deal with the fine balance between skills, education, experience and brevity in an industry that feeds off of all of these?"