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Exact date is not yet determined but the trip is gonna be between july 15 and august 15, 2011. On what days would you put weekends? Yosemite is probably a must during workdays
Weekends in the NP's will be the busiest, but this time of year you are going to get a lot of visitors anyway. Once you're 'in' you can find quiet spots away from the crowds, but the kiosks and main areas can get busy. Not sure if it has been mentioned, but secure your campsites as soon as the booking window opens, they can sell out within hours of becoming available !! Also get an annual pass for $85, it will be cheaper than paying individual park fees. Get the pass at the first park you visit, or if you find yourself on 'Pier 39' in San Fran, they have an office up a flight of stairs where you can obtain one.