I'm following the deep litter approach. Start with 1-2 inches, and just keep adding. If they smell, you're losing nitrogen into the air instead of capturing it for your garden, so add more. The chicks are always on the top, on clean litter. Underneath it begins composting - when it's time to move them into their pen, throw the contents on the compost heap. Joel Salatin leaves his litter in place for the entire season, not changing between chick batches, just continually adding. The litter builds up a habitat of microorganisms (the same ones that turn things into compost) and seem to actually contribute to the health of his chicks.
I figure if it works for him commercially, in a pastured operation that doesn't use antibiotics, it's worth trying. A friend of mine who used to have a commercial egg operation keeps about 20 hens in her garden hoophouse over winter (fenced off on one end) and also uses deep bedding. She says that the litter-becoming-compost actually helps keep their shelter warm through the winter, and by spring the compost is nearly ready to use. By spring she's also finished pulling the last of her winter crops from the other end of the greenhouse, so she takes the fence down and lets 'em have at it for a couple of weeks before she puts them outside. They enjoy eating the last scraps of the garden (before there's much available outside) and also eliminate any bugs that might be lurking.
If you don't keep the carbon level right (the shavings) the ammonia gas given off by the poop can hurt their lungs/health (and yours too.)
I love that it's easy! But then - my attitude is strongly influenced by the fact that I got a batch of 50 chicks because I need the manure and their energetic scratching. I put my 4 hens and a rooster to work clearing out/manuring a new 20X60' garden bed, but they're too slow. Looks like they won't be done for at least another month. (They have a small portable pen, and I put temp fencing on a 20X20 area at a time). So soon I'll have a bigger grounds crew!