I can't make it to the gym as often as I'd like since my oldest boy started football. I don't have any equipment at home besides a heavy bag and treadmill so I'm going to give kettlebells a shot. I've used them before but only as part of a circuit at the gym so I've got limited experience. Can anyone recommend a good starting KB weight and program (DVD, youtube or book) to get started? I'm looking more for conditioning than strength. 
Pavel Tsatsouline's Enter the Kettlebell and onnit.com are good places to start. 
Dan John's 10k kettlebell swing challenge
Remember. ALWAYS lift with your back.
10,000 swing challenge on T-Nation, I have done it 2x and not gonna lie the results have been awesome. Burn an avg of 650 cal per workout.
Also try one arm snatches start with one rep, then two reps, then three, etc. Work your way up to ten reps, then back down.
Total for both sides = 220reps. This one gets my heart at average of 156 beats per minute for about 16 minutes (around 500 cal per workout)
Google Pat Flynn
Keith Weber.
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Fitnessblender on YouTube has some really good kettle bell workouts.
Dick swings, milfmills and renegade hoes... All excellent exercises.
make sure you get a snug fitting maxi pad to keep the sand from falling out of your vagina
hehehe i kid i kid
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Look up Pat Flynn on youtube, he's got a ton a simple quick complexes.
Keith Weber has two kettlebell DVD's, both of them are excellent.
Dan John is also great.
Basically everything noted in this thread so far are great sources. Make sure you actually have decent form though. It might be worth it to go to a certified RKC or something for an actual lesson on proper form just so you don't end up hurting yourself.
http://www.mixedmartialarts.com/thread/2403976/Kettlebells-to-get-strong/?pc=212
you're welcome.
also, don't try to do any kettlebell exercises without proper training. You can really get messed up
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www.mikemahler.com for the win. Lots of free instruction.
nothing miraculous about it. Heavy shit over your head. repeat. makes you strong and fit. I carry one in my truck.
iwrestledabearonce - Remember. ALWAYS lift with your back.
you trying to kill this guy? don't forget to lock your knees