What is the value of a 2006 US 5 dollar silver certificate?

Please check the top of your bill; it should say Federal Reserve Note across the top. The last silver certificates were $1 bills dated 1957 and the last $5 silver certificates were issued in the 1953 series.

There are two different designs of $5 bills in the 2006 series - the old green and black design with Lincoln's portrait in an oval, and the new purple and gray ones without a border around the portrait. Both are very common and have no added value.