People with schizoid personality disorder avoid relationships and do not show much emotion. Unlike avoidants, schizoids genuinely prefer to be alone and do not secretly wish for popularity. They tend to seek jobs that require little social contact. Their social skills are often weak and they do not show a need for attention or acceptance. They are perceived by others as humorless and distant and often are termed "loners."

Symptoms of Schizoid Personality Disorder:
* Weak interpersonal skills
* Difficulty expressing anger, even when provoked
* "Loner" mentality; avoidance of social situations
* Appear to others as remote, aloof, and unengaged
* Low sexual...

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People with schizoid personality disorder avoid relationships and do not show much emotion. Unlike avoidants, schizoids genuinely prefer to be alone and do not secretly wish for popularity. They tend to seek jobs that require little social contact. Their social skills are often weak and they do not show a need for attention or acceptance. They are perceived by others as humorless and distant and often are termed "loners."

Symptoms of Schizoid Personality Disorder:
* Weak interpersonal skills
* Difficulty expressing anger, even when provoked
* "Loner" mentality; avoidance of social situations
* Appear to others as remote, aloof, and unengaged
* Low sexual desire
* Unresponsive to praise or criticism

It is important to distinguish schizoid from avoidant. Avoidants will feel anxiety in social situations and have the desire to fit in, while schizoids simply prefer to be alone. It is occassionally difficult to distinguish between schizoid and Asperger's, as well.
http://www.4degreez.com/disorder/schizoid.html

I read this summary of the schizoid "disorder" after doing an internet personality test once. Some seem to see it as a semi-psychotic, schizophrenic-like disorder, but many people diagnosed with it really resent this and feel that it's not a disease so much as prefering a mode of living that our society doesn't understand or accept as normal.