In no particular order, I'd say the top needs are LB (especially OLB with the departure of Mario Williams), WR (a down-field threat opposite Andre Johnson would be very nice), and OL (while the Texans are confident they won't experience a huge drop-off replacing Mike Brisiel and Eric Winston, depth is a concern). DL and CB could also use some attention from the perspective of adding depth.
For more news and notes on the Tennessee Titans, visit Music City Miracles. Check out our 2012 NFL mock draft as selected by SB Nation NFL bloggers. And make sure to visit SB Nation's draft blog, Mocking The Draft, for more on the NFL draft.