Today is Labor Day in the United States and the search engines have special logos up, except Google and Yahoo. There is no surprise there, historically, Google and Yahoo never have logos for the Labor Day holiday. So although Google and Yahoo don't like to put up logos for the day, Microsoft's Bing, Ask.com and DogPile do have logos.
Here is a run down of the logos for Labor Day 2009:
Bing's Labor Day 2009 Theme:
Ask.com's Labor Day 2009 Theme:
DogPile's Labor Day 2009 Logo:
Also, Cre8asite Forums designed a special logo for today:
And we dressed up this site, the Search Engine Roundtable, for Labor Day:
Forum discussion at Search Engine Roundtable Forums.