I'm not sure these transactions are really video-worthy (though that hasn't stopped me before!) so I'm just going to provide a little analysis on each one in good ol' text form. 56k users rejoice!
Matt Baker
Baker was the fourth and final quarterback on the roster after Casey Bramlet was let go and Chad Henne was picked up on Day 1 of the draft. Because the other three - Beck, McCown and Henne - are essentially all locks to make the team, there was really no point in keeping the guy

Steve Fifita
Easily the most surprising of these four cuts, given our lack of depth at nose tackle and the fact that he out-played 2007 fourth-rounder Paul Soliai, who remains with the team, last season. Hopefully, this is a vote of confidence for Soliai and our undrafted rookies (Kory Robertson and Anthony Toribio). Fifita was later picked up by the Patriots (surprise, surprise) and he could have a shot at securing a backup nose tackle job behind Vince Wilfork.
Derreck Robinson
A prototypical 3-4 end, but one from the previous regime in a now very crowed position. After we took three defensive ends on the draft, there was simply no way Robinson was going to make the club even if he did fit the scheme. It wouldn't be surprising if he landed in Baltimore, another 3-4 team that also features Cam Cameron as it's offensive coordinator.
Abraham Wright
Wright is another guy that fit the scheme, but he too had quite a few guys ahead of him on the depth chart. Our seventh-round pick from 2007 was a prototypical 3-4 outside linebacker, but he struggled with injuries as a rookie and wasn't going to beat out the likes of Reggie Torbor, Junior Glymph and Quentin Moses.