2006, three round fight.
BJ's boxing completely dominated GSP on the feet in rounds 1 and 2. GSP had a takedown in round 2 but BJ got back up, and GSP had a nice slam takedown in round 3. Again, BJ got back up. BJ took GSP down in the 3rd and GSP got right back up.
One area GSP dominated was in the leg kicks. He landed a lot, though BJ didn't seem affected.
GSP's face was completely wrecked from BJ's boxing.
More like it was completely wrecked by Penn's brutal eyepoke
which meant that St-Pierre had to fight with one eye for the rest of the fight. And was then transfered to the hospital for a cut eyeball from Penn's nail, which led to the pathetic "I spent my night partying; he spent his at the hospital!!"
Even Joe Rogan, who's a Penn dickrider "to teh death", made note of the eye-poke from BJ.
It's very telling that Cecil Peoples is the only who gave the fight to BJ
GSP>Penn
Sherdog gave GSP comfy decison, 2 rounds to 1.
Georges St. Pierre (Pictures) vs B.J. Penn
Round 1
Both fighters starting fast with kicks and punches. Nice jab from BJ. Georges bleeding heavily from the nose. Spinning back kick misses for Georges. Pace starting to slow a bit, with "Rush" pushing Penn against the fence. Georges shoots in but Penn defends. BJ smoothly defends another takedown attempt. St. Pierre is bleeding bad from just under his right eye and nose. Excellent right punch to St. Pierre's body. Round one ends with Georges's face looking awful.
Sherdog Score 10-9
B.J. Penn
Round 2
"Rush" starts with several low kicks, none of which connect solidly. Georges secures a double-leg takedown and brings BJ to the mat. St. Pierre working from Penn's open guard. Georges rises to his feet and dives in with a nice right hand that lands. BJ escapes to his feet. Penn looking a bit tired. St. Pierre lands a nice knee to the face, but BJ is unphased. St. Pierre lands a kick to the body and a right hand. "Rush" gets the better of a punching exhange, with BJ landing a left counter. Another takedown for St. Pierre.
Sherdog Score: 10-9
Georges St. Pierre
Round 3
Big slam takedown from St. Pierre to start round three. Penn working from guard with heels on hips. Penn escapes to his feet, with both now clinched against the cage. Both fighters trade jabs. BJ shoots for his first takedown attempt of the night. Georges goes to one knee but rises back to his feet. Nice elbow from St. Pierre. Yet another takedown from St. Pierre. No urgency shown from BJ yet, with only 40 seconds to go. Penn now works for a omaplata, but it's answered with a huge elbow as the third round closes.
Sherdog Score: 10-9
Georges St. Pierre (29-28)
And the rematch was such a domination that Penn had to quit on the stool, and then tried to sue St-Pierre and brought him mom to speak on his behalf at the the tribunal
"I thought my son was going to die in there, how could they lock him up in a cage with that monster??"
which meant that St-Pierre had to fight with one eye for the rest of the fight. And was then transfered to the hospital for a cut eyeball from Penn's nail, which led to the pathetic "I spent my night partying; he spent his at the hospital!!" 
