keeps you from having to switch windows when you excute the code in the browser, its more handy if you are doing things that have an impact on user end stuff like the GUI, there are no current programs, even DW that can handle things like floats with div tags very well other than browsers.Why are dual monitors so useful for development by the way?
(ps instead of the typical using hacks for the box model issues, try using overflow:hidden, I've managed to get two webpages to work with out hacks in both IE and foxfire using this sparingly)
i always have a couple of programs co-running between phases. or it even helps with things like research, copy and paste, and etc. if you have alot of data that has not been put into a table before that is written out, this is also helpful.sd