The Rorschach test is basically an exercise in forced pareidolia. Although it may well be true that ax murderers (as a group) may tend to describe the blots in more violent (as defined by the examiner) terms than birdwatchers (as a group), it's probably also true that what you "see" can be affected by personal experience (which could pose a problem if you saw a slasher movie the night before your Rorschach test).

The test's supporters claim that publicizing the inkblots and their most common responses may render the test invalid. However, those same supporters state that simply naming the blot is only a small part of the overall test. If this is true, then most of the test results should remain intact, and it may be possible to identify false responses based on changes in the nonverbal part of the response, such as a series of quick answers without much study of the inkblots themselves.

IMHO, although there may be some statistical correlation between Rorschach responses and personality, there are too many uncontrolled variables for it to be more than a secondary diagnostic tool on an individual basis.

For more information on the Rorschach test, the Wikipedia article is well researched and (for now, anyway) includes images of the inkblots and their most common responses, along with a cease-and-desist letter from the test's publisher.
Source(s):
http://en.wikipedia.org/wiki/Rorschach_test

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