The visitors ensured a tense finish when back-row replacement Williams went over for a try O'Gara converted from the touchline.
Replays showed that Owen was lucky to have been given the try with O'Driscoll clearly holding the ball up above the try-line.
Replacement Wilkinson reduced the deficit with a well struck drop goal but O'Driscoll secured the bonus point victory with his 58th-minute try, O'Gara converting.
That try moved O'Driscoll clear of team-mate Denis Hickie as Ireland's all-time leading try-scorer, with 30.
However, Lions full-back Lee Byrne conjured up a fine solo try which O'Gara converted before made six substitutions in quick succession.
Peter Stringer picked from the base and darted to the right before passing back inside for Leamy to muscle over for a try, O'Gara converting.
The choice proved a sensible one as the Munster home pack sent number eight Anthony Foley over for a try before O'Gara's conversion went over via an upright.
Steyn's thumping penalty from 66 metres cut Leinster's lead to 17 points and the home side then suffered a double blow on 57 minutes when VuliVuli scored a glorious individual try and O'Driscoll appeared to pull a hamstring in attempting to halt the Fijian.
Scores from Wainwright and Shenton sealed the win before Sherwin touched down a thoroughly deserved try, while O'Hara grabbed a late consolation score.
Things got worse for Derby six minutes later when Gary Teale stepped up to try to catch O'Shea offside but only succeeded in giving the Republic of Ireland defender time to pick his spot for his first goal this season.
O'Leary had to put a try-saving tackle in on O'Brien after a jinking run from Kearney.
But the Irish were rewarded for a spell of late dominance as center O'Driscoll went over the try line underneath the posts and Ronan O'Gara equalized with the conversion in the last action of the match.
Denis Leamy's try and a Ronan O'Gara conversion and penalty put Munster 10-3 up after 35 minutes.
Winger Rupeni Caucaunibuca scored a late try for Agen but O'Driscoll had the final say right at the end.
BBC: SPORT | Rugby Union | My Club | Leinster | Leinster 26-10 Agen
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Wales wasted a number of other try-scoring opportunities but O'Sullivan insisted his team did not get "the breaks".
Kearney was also showing a fine turn of pace and his initial charge in the 22nd minute set up a try-scoring chance for O'Driscoll but the Lions star knocked on with the line gaping.
Leo Cullen was grabbing his chance after his late inclusion in the Irish line-up and his line-out steal from another botched Italian throw set up the game's second try as scrum-half O'Leary sniped over for his first international touchdown.
The visitors could - and perhaps should - have been gunning for a Grand Slam, having beaten England, only to then draw with Ireland thanks to a late Brian O'Driscoll try and lose 9-8 to Scotland despite producing attacking statistics that suggested they should have won by around 30-40 points.
"I'm not coming here to be Samuel Eto'o, I'm somebody else, somebody new, but I will try to achieve as much as Eto'o, or even more, " he added.
Coughlan scrambled over between the posts for Munster's sixth try in the closing minutes, O'Gara completing his 100% record from six conversion kicks.
"Myself and the staff have worked hard since that black Friday in September 2001 to try to get justice for Martin O'Hagan, " he said.
But Hodgson's error gifted a try to Ian Dowling and Tomas O'Leary and Paul Warwick added further tries as Sale's hopes of qualification evaporated.
O'Gara was off-target with an early penalty attempt but Hurley made it 5-0 with a 15th-minute try in the right corner, O'Gara missing the conversion.
Ireland opened the second period with a penalty try, crucially giving them a bonus point for their fourth try of the game, which O'Gara converted.
With the home side's pack starting to turn the screw, Earls scored Munster's third try in the 47th minute after O'Gara's clever flat pass - although Timoci Nagusa's attempt at a tackle on the winger left a lot to be desired.
Instead Leinster doubled their precious lead, after coming close to the opening try following a moment of magic from O'Driscoll.
Biggar's Munster rival Ronan O'Gara scored a try and kicked two penalties.
Mr McGrath said he thought the new minister, Sinn Fein's John O'Dowd, would try to keep the savings as far away from the classroom as possible.
Despite going 10-0 behind courtesy of a Rob Kearney try and two successful kicks from Ronan O'Gara, the home side hit back for an important victory.
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