Ding! I also like repeating over the radio (talk show and news, national public radio is a good station) when I drove the car. Trying to mimic native speakers' intonation is very helpful! They can understand you much asier if your intonation is good.

My hubby's accent reduction training teacher suggested us to speak English at home (not only superfical talking, need discussion in more depth to help improving our English). So we now try to do it 2 or 3 times a week.

Recording and comparing should also work. I will start doing it soon!

I also go to Toastmaster club every week. It helps in polishing public speaking skills.

Hanging out with Americans also help a lot. I use to work mainly with Korean and Indian labmates when I was in the gradaute school and didn't feel much improvement in terms of speaking. I later worked on projects with Americans and hanged out with them more. It made a big difference in my speaking which helped a lot in my job interview later on.