Downloads web video, converts it to be iPod-friendly, and adds it to the iTunes library - with just one click.

YouTube → iTunes = One Click
"There are a lot of ways to get web videos. This is the easiest one."

Upon installation, TubiTunes prompts you to add a bookmarklet to your browser's toolbar. After that, simply click the bookmarklet when you spot a YouTube video you want (or just about any other web video), and it will automagically download the video and, according to your preferences, perform conversion and add it to your iTunes library, ready to sync with your iPod - all with just one click.