Pretty dismal to lose that one from what seemed a fairly safe position. With 5 wickets still in hand, so there's really no excuse. Symonds has been on fire lately, so I guess he'll just put it down as one of those days where he just couldn't connect.
I'm concerned that Bevan's lost his knack for pacing these chases though, and he seems to offer the bowlers a plethora of mis-hits and dot balls (and has for quite some time now). If the Aussies had just lost wickets or were bowled out, that would be one thing, but losses like this shouldn't occur.
Maybe, as someone already suggested, Bevan needs to be moved up the order in more of an anchoring role - because, from where the Aussies were at in the 45th over, most teams would have won pretty comfortably (particularly when no wickets are lost in that period!). When he's not rescuing the Aussies from certain defeat in low total chases, Bevan seems to lack firepower in these kinds of situations. Great final over from Vaas, but IMO, the game should have been parcelled up before it had begun.
Disappointing, but in a sense, Ponting was in dire need of such a reality check. The Sri Lankans will get a huge amount out of this victory, and so they should. First time I've seen the Aussies choke that badly for a long time.