I have friends who read tarot cards, and I myself have read tarot cards in the past (during the Hippie days, as if I actually had those). But I view them as a projective technique where what you are thinking about and hoping for is reflected in your reading of the cards.
The Myers-Briggs Type Indicator [MBTI] is a personality inventory which can give you some insight into how you approach the world. The Myers & Briggs Foundation web site contains lots of information on this instrument and you can take the full instrument online or offline many places. Professionals are certified and can give you a full administration and reading of the MBTI instrument. But taking it online is also informative! Just remember that this instrument is licensed, and the freebie versions aren’t the real instrument.
But, here’s some online fun with a slant on the MBTI – the Typealyzer.com web site reads entries from a blog and then gives an assessment of MBTI type based on what it sees there. Don’t ask me how they do it, though I have my theories. There’s always the caveat that what you write may not reflect how you would score in the actual MBTI, but I think it’s pretty interesting. Try this site on your own, or any other, blog. Just give it a URL and you’ll get back a type!