The death rate for hospitalizations is 5-10%, and for ICU cases possibly as high as 20-40%. From the state of California swine flu statistics page,
http://www.cdph.ca.gov/data/statistics/ ... uData.aspx , the current number of confirmed cumulative hospitalizations is 5380 and deaths 297. That's a death rate of 5.5%, which is consistent with current nationwide CDC numbers. But often there is a lag between hospitalization and mortality. Over the summer, dividing the deaths in one week by the hospitalizations in the previous week gave a pretty consistent 10% mortality rate.
Again, that is all hospitalizations. For ICU cases, go the link for provisional data by jurisdiction. This gives a statewide total of 851 confirmed severe cases, 812 confirmed ICU cases, and 249 confirmed deaths. Not all fatal cases were admitted to the ICU, but if most of them were that gives a ~30% fatality rate for ICU patients.
I think the consistent numbers that have been emerging is that 1 in 500 symptomatic cases are hospitalized (look at the ACHA numbers for college students) and 6% - 10% of all hospitalized cases will probably end up being fatal.