Reading through this thread some poeple do have an interesting definition of choking, Ireland haven't choked, they've been ****, there's a massive difference.
People mention the England game in 2003, that day they were awesome, no team on the planet would have competed with them that day, that was the finest performance under the Woodward stewardship so we didn't choke on that day.
In 2005 we lost key players at the wrong time, we don't have the strength in depth of the top nations and so are hit harder than other teams.
2006, Paris, we were shite in the first half, made mistake after mistake and gifted the French 40 points, it was never a case of building a lead and throwing it away, you could make more of a case for the French choking in the second half of that game, as they did against Wales the same year.
The strongest case for Ireland choking was against France in Dublin this year but again without O'Driscoll and Stringer but again defensive mistakes cost us dear, the lead was never big enough for us in that game to throw away.
So having dealt with that and getting back to the question of who will have the choker tag, I would have make the argument for the French, they certainly have the form, having choked in 1999 and 2003, 1999 they put in an awesome performance against NZ and just don't show up in the final, that's choking, 2003, they breeze through to the semi-finals and freeze again against England, and even this tournament they choked on the opening night, they just didn't turn up against Argentina and I wouldn't be surprised if they beat NZ in Cardiff only to lose to the Aussies in the semis.