I neglected to post this on Monday: Sedrick Ellis has indicated that he's coming back for another year as well.
According to the LA Times article:
Ellis, who sat out three games because of a knee injury that required arthroscopic surgery, said that Jackson's decision to stay influenced him to also remain at USC.
"That finalized it," said Ellis, who roomed with Jackson as a freshman and sophomore. "That put the laminate sealing on it."
Even allowing for Sartz and Lua graduating, you have to like the looks of the defense for the 2007 season -- providing they don't all change their minds in the spring, that is.