=IF(B2="",TODAY()-A2,"")

If you want to limit this to workdays (Mon-Fri) try:
=IF(B2="",NETWORKDAYS(A2,TODAY())-1,"")
--
Best Regards,

Luke M
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"Machel" wrote:

What would the formula in C column be if I want to know how many days from
the A column date to today - if the B column is blank?

A B C
Start Date Return to Work Date Out How Many Days?
06/29/2009
01/11/2009 02/02/2009

Thank you for your help!