Curbed LA
Popular real estate blog with entries offering insight on residential and commercial projects throughout the city as well as current market conditions.
The Eastsider LA
These guys have their finger on the pulse of what's happening all over LA's eastside including specific home and real estate news.
A decent guage of current interest rates and a handy mortgage calclulator so you can play around with the numbers.
The MLS
The multiple listing service is, in our opinion, the best source for finding a property in Los Angeles. This is their guest site, a limited version of what members (agents and brokers) get.
Zillow.com
A fun but not entirely accurate way of checking home values for different areas.