Learn all about Snow Leopard’s secrets using the Secrets app.
The hidden tweaks are a mix of features that didn’t quite make the final cut or were deemed too slight to deserve their own tick-box, and deep system changes that normally call for terrifying terminal commands. And they don’t stop at Snow Leopard: Secrets, which has been around in one form or another for a while now, has collected a huge library of “gray” settings for other apps too, from Apple’s various software suites to civilian apps like Skype and NetNewsWire. The app is free, and installs as a PrefPane.