Information
TypeLogic - A detailed description of each Myers-Briggs type.

Life Explore - Lots of information on the Enneagram and the Myers-Briggs theory, plus lots of links and list of resources.

The Personality Page - Easy to understand information on Personality Types.

Myers-Briggs - Working out your type - Overloads you with information for the purpose of working out your own Myers-Briggs type.

Tests
BLOGinality Personality Test - A four question test, easy and quite accurate.

Jung Typology Test

Adapted & FREE version of Mysers-Briggs & Keirsey Personality Tests

List of heaps of personality tests, both free and otherwise

Keirsey's Temperament Sorter II - Long & Formal