Here's a pretty neat listing from WoWwiki of all the Dungeon Instances categorized by kingdom, which includes pertinent information such as locations, enemy level range and maps. (It's got me very curious of the early Horde-only dungeons, and also the upcoming cross-factional dungeons like Necropolis Naxxramas.)
WoWwiki also has a very informative must-read Instance Grouping Guide, which contains excellent role/class tips, the perfect pull technique, how to survive wipes and the article Don't Be A Newb: Learn To Assist! (Groups that successfully Assist perform better than a group 5 levels higher that does not. Note: The Main Assist or MA is not necessarily the Main Tank or MT.)
Definitely check it out -- I just learned a bunch of new things from it and I'm going to have Jor try that Hunter's Feign Death + Trap combo they suggested tonight. There's also a funny section on When It All Goes Wrong: Incorrigible Personality Types that's good for chuckles.
And since there are some new players in the guild that are also new to WoW, please check out WoWWiki's Instance Grouping Guide. Even if you've already read it, it's a great refresher and totally worth re-reading for the hilarious "Incorrigible Personality Types" section:
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