Australia captain Rocky Elsom was left distraught by his side's inability to pevent Ireland snatching a last-minute draw on Sunday.
The Wallabies were on course to follow up their win over England when Elsom's 62nd-minute try put them 20-13 ahead.
But, with time running out at Croke Park, O'Driscoll, a former Leinster team-mate of Elsom, marked his 100th international with his 37th try for Ireland and Ronan O'Gara kicked the conversion to snatch a 20-20 draw.
Elsom told BBC Sport: "As much as we didn't want to talk about it, it's a very big occasion and it's disappointing that we didn't notch up a win there.
"If we had defended that last phase, we would have deserved to win but who would have thought, in his 100th game, Brian would come up with the goods?
"I thought we could have stopped that last play but they executed really well."
Winger Drew Mitchell had given Australia a third-minute lead when he capitalised on a knock-on by O'Driscoll to score the opening try and Matt Giteau kicked the first of four goals.
O'Driscoll insisted Ireland's courage enabled them to salvage the draw.
"I'm pleased we were rewarded for showing the bottle to stick with them until the death and grind out a draw," said the Ireland skipper.
"We tried a lot of things. Not everything stuck but plenty of things did. If you don't try these things you don't get better.
"We'll all be better for having played together. It's difficult to click when you haven't played together for six months.
"Australia have played a lot recently and for the most part we did reasonably well."
O'Driscoll's try was the product of a well-drilled set-piece move that saw him run onto a pass from Tomas O'Leary to stroll over unopposed.
"It's a smart play that we've practised a lot over the last year. In the Six Nations we didn't have the chance to use it," said O'Driscoll.
"It's nice when plays like that come off."
Australia captain Rocky Elsom cancelled out a try by Tommy Bowe to help put the Wallabies 20-13 ahead with 19 minutes to go, but Ireland's late response was magnificent.
Head coach Declan Kidney was pleased with his side's ambition and attitude.
"Draws are a strange event in rugby but two minutes before the end I would have taken it," he said.
"The one thing you can't coach is attitude and we showed that in bucket loads to come back like we did after being under pressure.
"We didn't hit the ground running. There are plenty of areas we need to brush up on - the whole range in fact.
"We seemed to play a large chunk of the game in their half. They played a very smart game to keep the pressure on us.
"We said at the end of last season we're a good side, not a great side and I'll stick with that."
Winger Luke Fitzgerald suffered a knee injury and will undergo a scan with an update expected over the next 48 hours.
Australia coach Robbie Deans felt Ireland had "escaped with a draw" but admitted they were far superior to England, who the Wallabies defeated 18-9 last weekend.
"It was clearly a game we could have and should have won," said Deans.
"The fact Ireland were still within seven points near the end was the critical element.
"We played enough rugby and had enough possession and opportunities to get beyond that but didn't do it.
"When you leave the door ajar to a team that has the maturity, belief and persistence of Ireland, they'll come back and save their skins.
"Ireland escaped with a draw. It was only in the last seconds of the game they were able to level with us so we are frustrated.
"There's no doubt Ireland were a step up from England. We stepped up our performance today."
Comments
Clayton26 says...
Good game, although perhaps not that encouraging for Ireland. Australia is of course the weakest of the Tri-Nations, and the 6 Nations Champions could only settle for a draw... just.
Posted 02:58 16th November 2009