Kettlebells are great. Thing is, exactly what you should do with them kinda depends on your goals. What's most important to you? Gaining muscle? Losing fat? I recommend checking out some videos from StrongFirst and reading anything & everything by Pavel Tsatsouline if you're serious.
A couple other quickie thoughts:
1) A swing is not a squat-front-raise. It's a swing.
2) In a related story, swings should be done fairly heavy. If you find yourself "swinging" a 20 pound kettlebell, I suggest you re-evaluate things.
3) A kettlebell is not just a weird shaped dumbbell.