If you want to see this calculated by the second, then check out this Money Meter from Forbes.com
It calculates the amount you earn per second based on your annual salary.
This is my Money Meter at 4 mins and 59 secs :
After my nine hours session of Warcraft today. I do feel slightly more productive after seeing this Money Meter. (I'm On-call for this week, so I do get paid - even if I spend my whole day playing Warcraft).
$2.70 for 5 minutes. Too bad it's showing the amount before Tax .... :(