I'm Andrew, a community manager here in Trulia Voices, and so can speak on Trulia's behalf.
You can find a rough estimate of what your house is worth by typing your address into http://www.trulia.com. However, this provides a rough estimate and should not your sole source for information about your home's value.
To do that, you will need to speak to a real estate pro. We've built a great tool which allows you find the best real estate pros in your area, based on recommendations, knowledge, experience and activity in the Trulia Voices community. You can find that tool here: http://bit.ly/IwLxD8
Let me know how else I can help,
Community Manager, Trulia Voices