Friday Fun: Google Trends
Google Trends lets you compare search volumes for multiple terms.
I can’t think of any other searches off-hand that would give us the spikes we get below.
And not that it makes any difference, but curiosity makes me wonder (for probably no more than 7 seconds) why Labor Day was down a bit in 2005 while Memorial Day was up a bit in 2006.
“labor day” 
“memorial day”
