[Blarg]

I've never seen Mahler's stuff, but have seen nothing but tremendous praise for his kettlebells for size and strength one. However, it is oriented toward using double kettlebells of the same weight, so while you will likely learn a lot that is useful, the routines themselves won't really fit you if you have different weight bells. I'd very strongly warn against using two different weight bells, especially for overhead lifts. Kettlebells are off-balance in the first place, and using them overhead at different weights is much more dangerous than, say, doing that with dumbbells. I also would avoid double KB swings with two different size kettlebells, as your lower back is much involved, and I can see harm and imbalance coming out of that easily.

I'll put in another word for Steve Cotter's FullKOntact kettlebells DVD's. I own both and they're great. Their emphasis is on using KB's in ways that will pay off for martial arts, and there's a lot of leg work in there. You can go to his website and see short clips for free. His towel-swings and duckwalks while towel-swinging and pressing KB's are tremendous. Lots of his stuff starts out simple, but variations gives you really cool goals to work toward.