The FDA has listed a number of drugs that had modifications to the BOXED WARNING, CONTRAINDICATIONS and/or WARNINGS sections. http://www.fda.gov/medwatch/SAFETY/2..._quickview.htm
-- provides drug names and a listing of the sections changed.
The Detailed view -- http://www.fda.gov/medwatch/SAFETY/2006/jan06.htm
-- includes sections/subsections changed and a description of new or modified safety information in the Boxed Warning, Contraindications, or Warnings sections. The full labeling may be accessed by clicking on the drug name in the detailed view.
The list is pretty long but includes familiar drugs adults often take and some for children - since most of you have kids, thought you might be interested.