Funny, just had a similar discussion by PM with someone who questioned some of our rankings/projections...
DL (Outside consensus top 40/Could finish top 20)
Tamba Hali
Travis Laboy
Andre Carter
Kalimba Edwards
All guys who are already starters or, in Hali's case, could emerge from training camp getting a significant number of snaps. All four could get 40 tackles and double digit sacks. There are one or two others, but these would be the favorites using the above criteria.
LB (Outside consensus top 50/Could finish top 25)
Akin Ayodele
Boss Bailey
Shelton Quarles
Brian Simmons
Anthony Simmons
Gerald Hayes
This one is more difficult -- there are all kinds of players that shoot up the charts if there's a key injury (Ruud, DJ Williams, Dem Williams, etc, etc). These guys are currently ranked under 50 but are expected to start and contribute from week one. I'm not sure I see anybody in a 50-50 training camp battle that could jump up here.
DB (Outside top 50/Could finish top 25)
Bernard Pollard
Glenn Earl
Shaun Williams
ETA: We're close to posting an article detailing each team's over-valued, under-valued, and deep sleeper players. No hard deadline yet, but it should be released by the end of the month.