Brian S. , Oct 22, 2010; 02:50 p.m.
I hate to break the news to you but the only "secret" might be waiting for them to grow up. And that might not even work.
I have no tricks to offer other than the ones you already seem to know. Parents are a mixed blessing - sometimes they help, other times they get in the way. Catching the kids in between sleepy, hungry, grumpy, and (insert any other childish emotion here) helps... but scheduling that is impossible. For me, having plenty of time available has helped, as has having some "cool toys" to get them in the mood. Good luck!