Shoutbox

While a bit of theory is always nice, do you guys have any concrete suggestions to downloadable equalizers? I guess it all boils down to this: Basically I need something like Winamp's equalizer

which has the "Preamp" bar that will actually make most any audio source LOUD when cranked up (and I frankly don't care about how that's achieved) Only difference is that it needs to be able to affect ALL sound output on the puter.
This is a terribly common laptop problem, I'm surprised the web isn't oversaturated with solutions to this...