One of the featured videos on YouTube that caught my eye belonged to the SearchEngineRapBattle.com. The videos are pretty funny.  Here are some of the lines I like best:

MSN Vs. Google
Google: “Smart people… they wanna work for me, that’s why I jack you for your employees.”
MSN: “You stole my people?  Here’s the story, I bought Facebook and jacked your employees.”

Google Vs. Yahoo!
Yahoo!: “The only sports you play are in my fantasy league.”
Google: “Who’s this guy?  Is he still alive, folks? I thought he died with AltaVista and Lycos.  I’m smarter than you, and you know it.  It’s sad.  That’s why you pay me to serve all your ads.”