I have been tracking uhaul rates for about 4 years, mostly to/from san diego/denver (and San antonio). I followed the largest residential moving truck rates. The ratio of the “move from” SD to “move to” for the aforementioned cities pretty much held constant at about 2.7. In early Dec 2008 that ratio dropped to around 2.1. I believe there are fewer families moving out of SD because the employment picture in destiation cities is currently not bright. Since California will probably be one of the last states to recover economically (many other states will recover earlier), it follows that outmigration will increase as the job prospects elevate in destination states.