In presence of italic contents in a shrink-wrapping container, sometimes IE7 displays an unnecessary horizontal scrollbar. In this test case there is a span with hasLayout and text-align:center in effect. The same problem occurs with:
italics in a right widthless float
italics in a widthless absolutely positioned box with right:0
Overflow:auto on the element with italics seems to solve the problem
These can be troublesome to figure out. Hope this helps.
If you have other examples, please share.