Yes, as expected Australia did defeat Ireland , and by 9 wickets, a margin which was not surprising given that Australia won the toss and, as Worldcupspeak now puts it, "chose to field".
The match was all over before the lunch (or between innings) break, and I've heard some comments to the effect that Australia, who won the toss, should have batted. As if it was an exhibition match...
No Irish batter looked like staying long enough to compile a half decent score, even though some of the Australian bowling was a tad ragged. Tait, the main offender, compensated for a reversion to his pre-tournament waywardness with some very quick deliveries which clearly distressed the Irish by taking two wickets in successive balls at the start of his second over and a third later. Glenn McGrath (7-1-17-3) was, well, Glenn McGrath 2001 vintage. There was no recovery from 3/2, 4/12, 5/32 and so on, despite some resolute defence and a few bold strokes from the lower order as the total crawled to 91 all out from 30 overs.
Australia promoted Michael Hussey to open with Adam Gilchrist. While the latter was his characteristic self (34/25b), Hussey (30 no/45b) didn't always look comfortable early on, but eventually came good, bringing the game to an early finish with a pulled 6 over midwicket.
Australia are now confirmed semi-finalists. Who will join them in the top four remains to be determined. Sri Lanka have an easier run home, while England, New Zealand and South Africa will most probably contest the last two places.
Mark Taylor and Ian Healy in the Channel Nine Studio in Australia are collectively much better than the grab bag of commentators who provide most of the (Fox Sports?) TV feed commentary. Tony Cozier, who revealed that his son is working as part of the production team and that the media centre at the ground is named after his late father (and two others), and Mark Nicholas are good but many of the others are conspicuous only by their silence or blandness.