I think all the other questions have been answered. The reason the link you posted is now dead is that the Australian Mathematical Society updated its (very old) website recently. Yes, you can find this link on web.archive.org. For what it's worth, your link is the 2008 list. The 2010 list, the final edition of the ERA rankings, can be found here http://www-users.math.umn.edu/~arnold//math-journal-ratings/ - this is "only" 10 years out of date rather than 12.