Just a quickie. I’ve often used the great initial.css stylesheet from Faruk Ates (site currently down) and Robert Nyman which allows you to initialise basic styles on a page (it resets margins, line-height etc). A long time ago I added a few extra classes that, I suppose, for the very basics of a CSS framework. Nothing fancy, certainly not like the 960 grid system, but useful all the same.
Take a look at the demo file here. You can also download full-fat or skimmed versions of the CSS file.