This is very nice. You can personalized console.logmessage styles google chrome.
How?
console.log('%cBlue!.', 'color: blue;');
The propertie %c receive style.
Or in Windows XP
C:\Documents and Settings\<User Name>\Local Settings\Application Data\Google\Chrome\User Data\Default\User StyleSheets\Custom.css
.console-error-level .console-message-text{
color: red;
}
.console-warning-level .console-message-text {
color: orange;
}
.console-log-level .console-message-text {
color:green;
}