RTN is a pretty new private tracker that caters general/0day content. It was formed in August 2009 and is run by the same staff from HDME.eu. I highly recommend this tracker for users that are new to the private tracker world and would like to use some experience before heading off to higher leveled ones.
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Since it's a fairly young tracker it's looking to foster a greater community. Sign-ups are open as they have yet to fill their 10,000 user base. For a tracker that is just 4 months old, it has gained a solid install base and speedy downloads on certain 0day releases.