We just got two rain barrels this summer - our county hosts a rain barrel workshop every other month and you can get the rain barrels there at the workshop with the faucets already installed ($10 each). Make sure that you get only barrels previously used for food items, not ones that held chemicals. There are lots of threads on using and installing rain barrels - see if there are any workshops in your area. You will need a pump set up for your yard it seems. Without a pump, they are fine for hand watering, but there is not enough pressure to run a drip irrigation system or lawn sprinkler system. I love the old ways - especially now that I am getting into organic gardening.
“No Bird Soars Too High If He Soars With His Own Wings” ~ William Blake