Wow! I've never been west of North Dakota, but I might have to make the Cali trip this year. What a lineup. I really doubt I could see ATDI, Refused, James, Kasabian, Kaiser Chiefs, Radiohead, Mazzy Star, Squeeze, Miike Snow and so on all in one weekend ever again.
My biggest concern is the overlaps. Saturday in particular looks insanely packed, and I know I'd end up missing a few bands I want to see. Sunday conversely looks pretty relaxed.