Of the four UDFA's that we signed early, three of them (Jared Bronson (TE), Mark Lewis (OG) and Ryan Baker (DE)) appear to be practice squad/filler guys, but one guy worth keeping an eye on might be Orion Martin (DE/OLB) from Virginia Tech. 

He might not have the requisite size (260) to be a DE in the NFL, however he seems to possess the speed and tackling ability to play a decent OLB. What's more, he has an interesting story, and seems like the kind of guy Parcels likes. 

A couple of draft sites had him going in round 5, so we might have picked up another steal here.

Here's a quick synopsis from walterfootball.com 

Orion Martin, Virginia Tech 

Height: 6-2. Weight: 260. 
Projected 40 Time: 4.70. 
Combine 40 Time: 4.88. 
Pro Day 40 Time: 4.70. 
Benchx225: 24. Vertical: 31. 
Projected Round (2009): 5-6. 
1/9/09: Orion Martin finished strong, collecting 13 TFL, 7.5 sacks and four passes broken up. 

5/7/08: Probably a right end in the 3-4 at the next level. Orion Martin notched 78 tackles and 4.5 sacks last season. 

For more detail, I've linked his CBS scouting report, but the cool bit is here:

"Still, some scouts believe that Martin might be a better fit as a strong-side linebacker in the National Football League. He has proven to be capable of shutting down the passing attack, as only 18-of-97 passes (18.56%) have been completed in his area by the opposition, good for 112 yards. Those numbers translate to a miniscule 1.15 yards gained per pass attempt and 6.22 yards per pass completion during his time at Tech."