As mentioned in the previous posts I have recently rolled a dps arms warrior. I am interested in both dungeons and pvp. What site is a good starting point for learning important warrior macros?
WoWWiki and Wowpedia keep documented lists of "useful macros". Beyond that, WoW Macros has sections for macros based on classes (such as their warrior section) and World of Warcraft Macros Database does the same thing. Some of these macros can be a bit dated, but generally-speaking you can find some useful stuff.