When they haven't been "experimenting" with Devin Hester at quarterback [1] in minicamp (well, for one play, but what do they have to lose?), the Chicago Bears have been getting their house on order on the defensive line by signing three-time Pro Bowl tackle Tommie Harris to a four-year, $40 million contract extension with $27 million in the first three seasons. Harris has dealt with knee injuries, but he's as dominant as any lineman in the league when he's healthy.
Links:
[1] http://www.chicagobears.com/news/NewsStory.asp?story_id=4809