The best opportunities aren't the ones being screened by HR. Most job postings look like someone got a description of the job from the manager, looked for the sentence fragments that could be classified as skills or experience, then put those in as the list of requirements.

LinkedIn is probably a closer approximation to what's needed, but as far as I can tell it's hard to get far out of your acquaintances with a basic account.

SimplyHired and Indeed are mostly aggregators of other boards. It's just a slick interface on a broken system.

I'd like to see something that's a little more direct, that gets me to HR/hiring managers with fewer people in the middle.