Forbes has listed their 2009 NFL Team Valuations and the Jaguars have come in at number 29 out of 32 teams. There was a 1% drop in value from the previous year, and all of the figures are based on the 2008 season. Several teams declined this year, but I am sure it will a lot worse for the 2010 list.
http://www.forbes.com/lists/2009/30/football-values-09_NFL-Team-Valuations_Rank.html
There are alot worse things than being the least valuable NFL franchise.