Here is another decent private tracker that is currently open for signup. This tracker is somewhat similar to Demonoid in concept. It has a very large user base (around 500000) and a large number of torrents. So there is huge amount of content but sometimes leeching may occur one newer releases .
Site Name: ZAMUNDA.NET
Signup URL: http://zamunda.net/signup.php
Note: If you leave any fields blank in the signup form it wont let you continue. You will need to fill even the web site field. If you don't have a web site just fill it with a general site.
If you cannot understand the form and menus, change the language to English from the top left corner (see screenshot below):
Also make sure you read the rules and the FAQ.