One of the first things i do when hit level 80 is start doing some reputation farming in order to get good items before doing dungeons, a problem i always had was that i had to go to wowwiki every time and make a list of what factions had the items i needed for my role as well as the necessary reputation with said factions. However i found a very useful list with that information. Here is the link:

http://www.wowhead.com/forums&topic=...-rewards-guide