I think I heard yoga helps, but that's probably only if you've done it before, and probably only certain positions.
Don't do castor oil or the fruit thing, that just gives you the runs most times. But no baby.
Spicy food doesn't make any sense. I mean it would stimulate the baby, but I wouldn't be too sure about contractions.
Sex is supposedly the *second* best idea, the first being to let it come naturally.