There was a good (and short) article in the Vancouver Sun this morning that talked about the MLS system and why it is different, and more reliable in very important ways, than other sources for home listings.
For example, did you know that for all MLS listings, Realtors are required by law to disclose hidden defects in a property, while non-Realtor "for sale by owner" listings have no such requirements?
As a Realtor, I am obviously biased... But, my experience has shown me that the many good Reators that I know provide a very valuable service, and steer their clients clear of many unknown & hidden pitfalls.