I was testing the Emu  yesterday and I took a level 1 player, and attacked a Large Rat(level 1) in Qeynos.  To my surprise, it hit me for over 7 points of damage.... EVERY time.  
I believe in EQlive, they have a damage cap for each level.  i've noticed it, and have done testing.
Max Cap Damage:
Level 1:  4dmg
Level2:  6dmg
Level3:  8dmg
Level4:  10dmg
Level5:  12dmg (add bash capability)
Level6:  14dmg
Level7:  16dmg
Level8:  18dmg (add double attack)
Level9:  20dmg
Level10: 22dmg
Level11: 24dmg
Level12: 26dmg
Level13: 28dmg
Level14: 30dmg
Level15: 32dmg
Level16: 34dmg
Level17: 36dmg
Level18: 38dmg
Level19: 40dmg
It goes up by 2 dmg every level all the way to 50.  After 50, it becomes complicated, and I think the modifiers are different for each dungeon.  Basically all NPCs on the main continent follow the standard +2 dmg per level.  They all have the same attack% (that follow in the level category).  I have no idea what they are.
I notice that when you have 10ac fighting a level 1, it's more apt to hit you for 4dmg more often.  When you have ~30ac, it hits you for 1dmg alot more.  You guys probably already know this, but if you don't, this is some info 
I just wanted to let you guys know because I attacked a ghoul guk knight, and was hit for 180pts of dmg... where as their max should have been 92.