Flip4Mac
Starting with Version 3, they have introduced audio watermarking so that you now hear "This is a demonstration of Flip4Mac" every few minutes! Very annoying!
Mavericks (MacOS 10.9) Users
To remove the audio watermark, You MUST pay for the "Player Pro" version of Flip4Mac.
Pre-Mavericks Users
Do NOT get the latest version of Flip4Mac!
If you have already installed Version 3, please Uninstall it first, then run kJams and go to Preferences->Audio and click "Clear Cache", then quit kJams.
Then, download the previous version 2.4.4.2, which has NO audio watermark.
After you install Version 2, go to System Preferences->Flip4Mac->Update, and set "Check For Updates" to "Never".