RBs, LBs, and Ss tend to fall on draft projections leading up to the draft. CBs, QBs, OTs and WRs often climb.
I wouldn't be surprised if Peterson drops. But, I think he'll stay in the top 10.
This is kind of ticky-tacky, but I've found that lately, you're right about LBs, Ss, and RBs, but you ought to add OTs & QBs to that list. Matt Leinart was supposed to go earlier in the last draft, and let's not forget the Aaron Rodgers debacle. Remember how Marcus McNeill and Winston Justice were sure-fire Top 10 picks?
DEs and DTs are the fastest late-risers (Mario Williams, Tamba Hali, John McCargo, Dewayne Robertson, Kamerion Wembley), then cornerbacks (Ty Hill and Jason Allen). WRs tend to go about where there supposed to. It's hard to remember a serious run on those guys, or a weird head-scratcher. Centers and Guards have been kind of oddball late-risers in the last few drafts, with guys like Logan Mankins, Chris Spencer, Shawn Andrews, and Davin Joseph going higher than anticipated.