In case it seemed like I watched things at all linearly...
1. Torchwood s1 start to finish 2. Utopia - Last of the Time Lords 3. Empty Child - Parting of the Ways 4. Doctor Who s3 start to finish 5. Doctor Who s2 start to finish 6. Torchwood s2 started airing, watched it as it came out (in, y'know, not-on-tv form) 7. Doctor Who s1 start to finish (I think while TW s2 was airing) 8. Doctor Who s4 as it aired 9. And forget exactly when, but Sarah Jane Adventures actually in proper order from the start! First series had aired when I started watching it, but got to enjoy the squee of "yay commissioned for new series!" 10. The utter WTF and despair of Children of Earth
Almost all of the Torchwood watching was done as groupwatches with our dear Ianto and Ten players (who got to be amused at my first-time-watching reactions to the not-new eps), and so were the finale parts of DW s3, then we watched TW s2/DW s4 together as their brand-new-goodness.
I started playing Jack before s2 had finished airing (I think after Reset), so that was why Jack had a handwavey "uh... temporary memory loss!" for awhile-- let me later on incorporate things!