[No1Addict]

I'm likely to vary this depending on the draw. If I have over 13 outs I'll push it hard and force the other guy to fold or take a coninflip.
Under 13 outs I'm not getting overboard unless I know the opponent is weak and likely to fold.

I think knowing your oppoent (notes, stats) is very important - you should tend to be aggresive with people whom have shown they know where the fold button is.