Ananda Ayurveda & Yogalish

Here a couple of sites to get a better idea of your Dosha. 

I recommend taking more then one quiz or even better, meet with an Ayurvedic Practitioner.

http://doshaquiz.chopra.com/

http://www.whatsyourdosha.com/index.php

http://www.yogajournal.com/health/498