I did the lost and found ( grey items worth 100Gish and 200-800k exp ) and the one with the rare items ( BoA blue weapons and such ) on one of my fresh 89s this past weekend and got 3/4 of a level. That was doing the grey AND the rare spawns + whatever mobs were in the way. Was a fun and rewarding day! i wanted to point out one of the rare items that is actually worth getting and using on your 90s http://www.wowhead.com/item=86125 it is like a dps potion you can use before a boss fight.. i have it macroed in.