4-0-what? Learn more about investing through a 401(k).
Yahoo Business allows you to examine the impact of increasing your 401(k) contribution. http://finance.yahoo.com/calculator/career-work/pay-08
Here is a calculator to keep track of your overall 401(k) worth: http://finance.yahoo.com/calculator/family-home/pay-07
Here is a complete overview of 401(k). http://invest-faq.com/cbc/ret-plan-401k.html