Are these adsense revenue sharing plugins legal? I thought it violated Google's TOS to place your adsense ID on other sites with a few exceptions like Senserely. http://wordpress.org/extend/plugins/adsense-revenue-sharing/
You can place your adsense ID on other sites. Take the example of DP. As long as the site is not violating any adsense TOS, you can place your adsense ID there.