Microsoft Clip Art Library closed
As per Microsoft in this blog post, they've closed the Clip Art library. They're trying to get people to actually use Bing. (Ha)
I did, however, test the link that Tom recently shared to access Clip Art and it seems to work (once you type in a term to search).
*My apologies if this has already been posted. I did do a search, but sorting chronologically wasn't working all that well.