Acid test 2 is an test from webstandards.org . Acid2 is a test page, written to help browser vendors ensure proper support for web standards in their products.
So here are the Acid test results for three browsers (IE7,Opera 9.25, Firefox 2.0.0.11)
IE 7
Firefox 2
Opera 9
And here is a link which shows the history of browsers and acid test from howtocreate.co.uk, which misses Opera 9.5 beta and Firefox 3.0 Beta, they are here
Opera 9.5 Beta 1
Firefox 3 Beta 2
IE 8 (this is from MSDN Blog)
You can download the latest(Beta) versions of these browsers here
Opera 9.5 Beta 1
Firefox 3 Beta 2
Remember there may be crashes and bugs in these, since they are Beta products.