http://xkcd.com/540/

Image too big to fit here, just click the link.

This probably isn't new, but this bash.org quote made me LOL today:

Vista is like an extra thick condom. More safe but slightly less fun....
Hah, even viruses have compatibility issues >_<

Edit: the other one that made me laugh:

<rizerz> A Japanese doctor said, 'Medicine in my country is so advanced that we
<rizerz> can take a kidney out of one man, put it in another, and have him
<rizerz> looking for work in six weeks.'
<rizerz> A German doctor said, 'That's nothing, we can take a lung out of one
<rizerz> person, put it in another, and have him looking for work in four weeks.'
<rizerz> A British doctor said, 'In my country, medicine is so advanced that we
<rizerz> can take half of a heart out of one person, put it in another, and have
<rizerz> them both looking for work in two weeks.'
<rizerz> A Texas doctor, not to be outdone said, 'You guys are way behind.  We
<rizerz> took a man with no brains out of Texas , put him in the White House, and
<rizerz> now half the country is looking for work.

This one is also too awesome for words.
http://xkcd.com/524/

This is by far the best he has done though:
http://xkcd.com/323/

It's funny cause it's true....