Found this interesting from last year's mock draft by WalterFootball, Thompson was pegged to be 1st pick of the 3rd round.  Maybe we already have players that fit the 3/4 scheme. 

#64 Miami Dolphins: Jeremy Thompson, DE/OLB, Wake Forest
The Dolphins finally get a 3-4 pass-rushing linebacker. Jeremy Thompson, who had 6.5 sacks last year, could replace the vastly overrated Joey Porter as soon as October.

 http://www.walterfootball.com/draft2008_3.php