I have a variety of brooder set-ups, from the simple/cheap to the large/expensive. I have a GQF three-tier brooder with the extensions on the bottom two tiers, and I got heating elements for the bottom two, I use this a lot for the newest chicks. As they get older, I put them into a number of things for grow-out, from horse watering troughs to large carboard boxes (those that fridges come in work well.) Put a large screen on the top, (we have cats) and hang a heat lamp over. We also use hoop houses once they\'re old enough to be on grass but not big enough to go in with adults.
Brooders are like anything else with chickens, you can run the gamut from simple to deluxe, depending on your desires and your budget. The basics are simple though: heat, dryness, food, and water. Get creative!