Rael recently noted a shift among Unix folk in pinging google.com instead of yahoo.com when checking for network availability:
It's not, mind you, that yahoo.com has become unreachable or unstable; just the Google has so come to represent the very essence of stability and reachability that it's made its way to our every ping.
While Google rules the ping space, Yahoo is still tops of the Web in terms of porn alternatives with a solid #1 ranking in a search for "exit" and a #1 ranking to Google's #2 for "leave" (that is, when porn sites give you a chance to "exit" or "leave", they're still linking that word to Yahoo more often than Google).