960 Gridder is an excellent tool for any web developer/designer that wants to easily align, match and/or layout websites. 960 Gridder is mainly developed with focus on initial layout or fine tuning of a website.
960 Gridder is cross-browser compliant and works well in Internet Explorer 6/7/8, Firefox 2/3 and Chrome. Safari 4 Beta and Opera 9 is also working as expected and it should work in Safari 2.x-3.x also.
960 Gridder is built upon the very famous JavaScript framework jQuery. 960 Gridder will automatically identify if jQuery is present at the website and if it is not, it will include it.
960.gs is the great framework, I used Blueprint for my earlier projects but will definitely try this one soon.