I had tried several android apps for my Nexus 7 and found many of them to be useless. After I uninstalled them on the tablet, they are still in my android online library under "my android apps" page. Is there a way to get rid of them from my library?
There is no way to permanently delete/remove downloaded apps in "My Orders/My Android Apps" from the Google Play website, or in "My Apps" from Play Store app. However, you can create a whole new Google Account and use it to install apps that you really need.