Artoomis said:
Now isn't that interesting. If that's true, then a Flurry of blows with Unarmed Strikes are all automatic hits. By the RAW.
Uh, you need to delve a little more into core definitions. Pull out your PHB and read the glossary--there's a lot of juicy rule goodness in there.
An unarmed
strike is one thing that can be delivered by an unarmed attack. You can think about it like a weapon if you need to (although it's not)--notice that unarmed
strike is described under the Equipment chapter. If you beat the foe's AC with your unarmed attack, you deliver the unarmed strike. If you don't, you don't deliver anything.
But delivering an unarmed strike is not the only thing you can do with an unarmed attack. Other things delivered by unarmed attacks include a trip, a touch spell, and even natural weapons.
Flurry says specifically you are allowed to use an unarmed
strike, not attack. If you scan the special attacks you were asking about, you'll see where I came up with those rulings based on the explicit limitation of being able to use an unarmed strike. You can't just go and replace one with the other throughout the rules where you see fit. Well, OK, you can, but you can't claim it's what the rules say
As for all the rest above, I agree with Hyp. Even on the kama used during a trip, which becomes a regular melee attack with the weapon, not an unarmed attack to deliver the trip. I glossed over that by accident.