As age pointed out, Australia hasn't failed totally. If Australia had managed to go to stumps a couple of wickets better than they did on day 2 (maybe Ponting and Martyn's wickets?
) given the way they played on days 3 and 4 it could have been a different result.
Australia should take heart from the way they've come back at the end of the each game and realise they just need a good start.
Ponting really needs to win the toss at the oval and bat. England will find batting much more difficult when they're facing a big total, just as Australia have. England have already crumbled chasing a couple of times in the series.
If the weather stays good, I'd expect a 2-2 result.