In 2008 the Ravens traded back from 8 to 26 with the jags before moving up to 18 to select Super Bowl Champion Joe Flacco.
No. 8: Ravens to Jaguars. Baltimore traded its first-round selection to Jacksonville for Jacksonville's first-round selection, two third-round selections, and fourth-round selection (No. 26, 71, 89, 125).
No. 18: Texans to Ravens. Houston traded its first-round selection to Baltimore for the first-round and (second) third-round selections Baltimore acquired from Jacksonville, and a sixth-round selection (No. 26, 89, and 173).
http://en.wikipedia.org/wiki/2008_NFL_draft