dont forget that the time in between sessions is just as important if not more than the actual meditation session. therefore guard the mind, build renunciation, build love + compassion, etc.
aside from that a good trick is to set a sophisticated intention before the meditation session. the better the mind is at the start of the meditation, the better the meditation.
for actual technique, spending 5min on a bodyscan at the start is a rapid way of getting the mind off habitually making concepts. since the body is in the present moment, moving from concepts which are aimed at the past and the future to the body for a short while achieves a lot already.
finally, once you have your object, dont change it and dont move off it
A Japanese man has been arrested on suspicion of writing a computer virus that destroys and replaces files on a victim PC with manga images of squid, octopuses and sea urchins. Masato Nakatsuji, 27, of Izumisano, Osaka Prefecture, was quoted as telling police: "I wanted to see how much my computer programming skills had improved since the last time I was arrested."