Scott Kirsner recently penned an article in the Boston Globe on interviewing tips, what not to do.  Great compendium (our contributions excepted perhaps but for you to judge in the article sidebar on page 2) of what some might think intuitively as “faux pas”, but many simply may not think of at all, and are at risk of committing.

http://www.boston.com/business/articles/2010/01/10/you_have_your_foot_in_the_door_how_to_keep_it_there_1263010162/?page=1