I track my net worth monthly on NetworthIQ.
Our net worth for February 2011 was $647,872. That is a $4,851 drop from January.
We fully funded a Roth IRA for my wife this month so that dropped our cash but increased our retirement. Net change for cash and retirement was positive. The key reason our net work dropped was that our real estate values continued to decline. Since we own rentals a considerable amount of our assets are in real estate so if the value drops a little then it can hit our net worth pretty hard. I'm hoping that the property values stop dropping soon.