Come on, this is a news that will interest webmasters !
Today, Adobe have published a preview of their new online tool :
BrowserLab.
This service allows to make directly online a simulation of your web pages rendering on web browsers Internet Explorer 6 and 7 (on Windows XP), Firefox 2 and 3 (Windows XP and Mac OS x) and Safari 3 (Mac OS X).
So, through
BrowserLab, you can test the compatibility of your web pages in different web browsers : sreenshots can be viewed in a single view, side by side view, or as an overlay view with variable transparency. Each viewing option features a zoom function.
If you want to try
BrowserLab, i invite you to follow
this way. You need an account on Adobe to access it, and there are a limited number of users.
In addition
BrowserLab is currently free, but it will probably be released as a paid subscription service, and the final price has not been determined at this time.
There is also a BrowserLab extension that you can download to use it from
Dreamweaver CS 4.
For more information, it's
here.