A few tips:
1. Spend Saturday mainly at DCA and Sunday at DL. DCA is NEVER as crowded as DL so visiting on a Sat. is better.
2. Since you last went some new great rides have been built. Check out Indiana Jones, Roger Rabbit's Cartoon Spin, and Haunted Mansion Holiday because those are relatively new and are unique to DL. The Buzz Lightyear at DL is supposed to be better (I will see next summer) so definitely ride that too.
3. Since you just got back from WDW I hope you are familiar w/ the FP system. Use it on major rides such as Space, Splash, and Indiana Jones. At DCA use it on California Screamin, Soarin over California and Grizzly River Rapids.
4. California Adventure is a very strange park. The first half of the park is true Disney quality with the original Soarin, Grizzly River Rapids, ToT, the new Monster's Inc. ride, and a great kiddy area. The back half of the park is quite tacky with a few unique rides. Many of the ride on Paradise Pier are basic carnival rides that run a short cycle. California Screamin and Sun Wheel are unique and worth checking out.
5. Touring each of the parks efficiently can be the make or break of the day. If you're travelign with little ones, start with Fantasyland. Here there are 4-5 rides that MK does not have. Then tour Tomorrowland, Adventureland, New Orleans Square, Critter Country, and Frontierland respectively.
6. In DCA start by getting FPs for Soarin and GRR(disconnected) and then tour Hollywood Pictures Backlot. Go back to the two FP attractions and then see Paradise Pier or A Bug's Land.
7. Rides taht will have minimal waits even during the peak of the day:
DL-Winnie the Pooh, HISTA, PotC, Snow White, Pinocchio, Casey Jr., Buzz and BTMRR (20-30)
DCA-ITtbaB, MuppetVIsion, Golden Zephyr, ToT (20 maybe because it's in a remote section of the park)
8. Have a great time.
