I found this spreadsheet on another thread.http://members.aol.com/stuje1/lawrankings.xls
According to it Hastings has only been ranked higher than Davis for two years since 1990 ('99-'00). Even if Hastings were to overtake Davis in '09 I think it will be short lived. Also, even if Hastings were to be ranked higer than Davis in '09 (and maybe even for a few years after), with such a solid history of Davis being slightly higer than Hastings I think professionally Davis will hold more prestige for a for several more years.
With that said, both are great schools, and when it comes down to it I think the biggest difference between them is not the rankings but the programs they offer.