This is a blog from Sally that shows swimming pools from all around the world. Sally is also the author of Sydney Daily Photo, so when you want to get out of the water for a little while, you can discover Sydney along with her.
This is a great place to not only purchase a pool, but to also get any supplies or info that you might need. They have some great articles about setting up your pool so that you can start swimming asap!
This site has a lot of good tools and articles for swimmers, parents, and coaches, including a medley relay generator, and an Ask a Swim Coach feature.