IE Windows: 3 pixel jog with floated content
This problem has been well documented on the Position Is Everything Site. Unfortunately their hack to fix it is elaborate and in my opinion more trouble than it's worth. I've been using a method with two floats that I've documented here that seems to solve the problem for us nicely.
IE Windows doesn't display bullet on List Items
If you use list-style-type inside a list (UL or OL) that has had its width set then that list will not display any bullet at all. There is apparently no work around for this.
IE Windows Doubles Margins in Floated Elements
Internet Explorer for windows doubles the margin on the side of contact for floated elements. To eliminate the extra margin put display:inline; in the style of the floated elements. The following link provides more exhaustive details.
IE 5 Mac, Commented Backslash
Many of the CSS rendering bugs that occur exclusively in Mac IE 5 can be circumvented using the Commented Backslash method.
Because IE 5 for mac is the only browser that lets you escape characters inside a comment with a backslash this will let you have CSS that gets run by everything besides IE 5 on mac.
Full documentation of this method is here