Maces, Mongoose, and Mounts
We also did The Champion of Anguish and I snagged myself a Crimson Cranium Crusher. Going from the sleekness of Vanir's to this honking mass of stone and steel is going to take some adjusting (mentally). Replacing my first epic was a bittersweet moment. It clearly out-powers, out-dpses, and out does Vanir's Right Fist of Brutality. I was sad to see the badge weapon that I worked so hard for, but was comforted by the fact that I had it the day that 2.4 went live and definitely got my money's worth. Of course this also meant that I had to level my mace skill from 92 to 385! I did manage to hit 382 by the end of the night. Those last few points are always the hardest (axes are next).
The real question though is Mongoose. It is still viable at level 80 or do the procs scale back like the did with Crusader from 60 to 70? I couldn't find anything on mmo-champion, wowhead, or Elitist Jerks that said the Agi and Hit boosts from Mongoose were lower or that the procs were less. Since I couldn't find anything contradictory I figured I'd have to test it myself. One of our warriors swore that the PPM was significantly reduced so I downloaded Procmeter and set it to look for Lightning Speed. Through the rest of the night in Grizzly Hills I got a consistent 6.5% chance to proc. I'll keep an eye on this as I continue to level and see if the proc rate goes down. Unfortuantely what I did not check was whether or not the Agi buff remained at 120 or if that is scaling downwards. I'll check that today and post findings in the comments.
EDIT 1:26 PM: CONFIRMED Mongoose still grants 120 Agi per proc above level 70. Mongoose is fully viable in WotLK.