Littleton is a great place to live, really not a lot of dangerous neighborhoods, and most of littleton sits in Jefferson County where the schools are great.
You can visit my website to search for homes, and use the lifestyle search to search based on school ratings and such.
Unfortunately we don't have a central system for rentals in Littleton, most people find rentals on craigslist.com, or in the classifieds from the denverpost.com. The rental market is very tight right now so if you find something good you'll need to jump on it. Rents are pretty high, usually costs a little more then buying the same home at todays rates.
If you would like to talk more about these things, shoot me an email or a call.
My website for doing the search is www.herronshomes.com