... And next week, Raise Rise!
Seriously, I would master the moves to make routines instead of single sleights routines. And Personally, I never bothered trying doing something like a sleight per week because different sleights require different amounts of practice and rehearsal. The sleights value and flexibility should also be taken into account- as previous posts have stated. The pass, for example, depending on the person, can take up to a couple years to master. Others, like Mark Lewis and I, have learned it relatively quickly (I had the basic move down in about an hour- I'm still playing around with variations for different situations). The move is extremely useful and versatile, as is the DL. Both are techniques that people work on a little at a time as long as they do sleight of hand with cards.
Regarding the backpalm- the subject of your post- I would say that if you really like the effect, it just takes practice. Start slowly with one card, the work to gradually increase your speed until you can just snap it into position while waving your arm. I just sat down and practiced the hell out of a few advertisement cards until I got it right.
As Lord Freddie suggested, I would read through Tarbell 2 to learn of all of the technique's uses.