A tool which will compare pages and show me how my page is seen under severall browsers. Althought I have my 5 browsers set , but one can not compare designs precisely.
Overlayed IE6 and IE7 renderings: Difference in the same area:
As you may see there are differences. Whole page is shifted down by 2 and right be 4 pixels, there is also big difference in spaces between tags.
That's a tool for a pixel perfect designers! IE NetRenderer.
There is only one problem – page is grabbed only for 741 pixels in heigh.