Today left me in desperate need for some form of laughter.

http://xkcd.com/572/ - oddly profound, but maybe just my mood today
http://xkcd.com/566/
http://xkcd.com/559/
http://xkcd.com/556/
http://xkcd.com/554/
http://xkcd.com/544/
http://xkcd.com/541/ - only because I've had this exact question on many occasions (oddly enough :) )
http://xkcd.com/540/ - qualified thanks to Napoleon's forces
http://xkcd.com/536/
http://xkcd.com/530/
http://xkcd.com/528/
http://xkcd.com/526/ - more because it's useful than because it's funny

Done through 520. :)