Time Magazine Archive

It has been out for awhile, but you may not have heard that Time Magazine offers its archive online from 1923 to 2006 for free. That's right - for free. It looks like it is based on advertising, so I don't know if this will continue, but it is a great online source that won't readily come up in a simple Google or Yahoo search. You can also browse by covers. A great source for older material.