Last week, University of Michigan Taubman Medical Library won the MLA Midwest Chapter's Jean Sayre Innovation Award for their Plain Language Medical Dictionary widget at http://www.lib.umich.edu/plain-language-dictionary.
It is based on CDC document, Plain Language Thesaurus for Health Communications, which I found online at http://depts.washington.edu/respcare/public/info/Plain_Language_Thesaurus_for_Health_Communications.pdf
More on how to use this widget is described in Patricia Andersen's blog at http://etechlib.wordpress.com/2010/09/17/plain-language-medical-dictionary-igoogle-gadgets-beyond-google/.
You can easily add to your iGoogle page.
Thanks to the University of Michigan and PF Anderson for this information.