My heads up play is flawed..

[splashpot]

I have many more 2nds than 1sts. I attribute this to poor heads up play. I'm sort of at a loss about how to go about improving, so I guess I'll start by requesting any good heads up articles. Anyone know of any? Or are than any good posts here geared towards general heads up play? I'm just taking a stab in the dark because I don't know where else to start.