Hi M.,
I'm using an IUD (intrauterine contraception) called Mirena. It's a contraception that has to be placed in your uterus by your doctor and releases a hormone into your system to prevent pregnancy. It works for up to 5 years. You don't have to worry about remembering to do anything, which is really nice. It's not for everyone so go online and read more about it: http://www.mirena-us.com/index.jsp.
Personally I like this IUD because it is effective (I've been using it for over 2 yrs now) and once we're ready to have another child, it takes a quick doctor's visit to remove it. Also, I haven't had my menstrual cycle (no bleeding, a little spotting)for over a year and half because of the Mirena, and my symptoms (cramps, backache) have lessened.
There's also another IUD called Paragard (http://www.paragard.com/)so you can check their website and do some research to see if either of these IUDs work for you.
Good luck.
-H.