i cant find anything on this 2 yr only tag rule...according to this article, the cardinals can tag him again.
http://www.azcentral.com/sports/cardinals/articles/2010/01/14/20100114spt-cardinals-karlos-dansby.html
Like other teams, the Cardinals could use franchise and transition tags to restrict players. In capped years, teams could use just one of those designations.
Dansby acknowledged there isn't much he could do if the Cardinals decide to tag him again.
"They have my rights," he said. "I'm just going to play it out and do what I do best, which is play this game."