Here's a list of the Normal and Level 50 dungeons (PvE) for both factions. Note that the Level 50 dungeons are divided into tier 1 and 2 levels. Disclaimer: This information is based on the beta. I don't know if things have changed.
http://www.dawn-guild.com/index.php?option=com_content&view=article&id=107:rift-dungeons-and-end-game&catid=47:rift&Itemid=111
Another list of Tier 1 dungeons
http://www.riftbro.com/2011/02/22/rift-expert-dungeon-list-tier-1/
Another list of Tier 2 dungeons
http://www.riftbro.com/2011/02/23/rift-expert-dungeon-list-tier-2/
Just because I have it, here is a list of the normal dungeons.
http://www.riftbro.com/2011/02/22/rift-normal-dungeon-list/
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