I just finished listening to Sam Webb's "Recruiting Roundup" on WTKA.com and he mentioned that there are a couple of kids who are silent commits to UM for the 2011 class.
Sam then received a call from "Mark from Novi" asking about the situation with Frost and Lyons. Sam's response regarding Frost was (paraphrased): "Michigan leads...BIG TIME." Sounds like Frost is a silent commit to me. Let's just hope he "sees the light" and realizes that he (and UM) will be best served playing OLB rather than WR.
Btw, while Sam's assessment of the situation with Lyons was not quite as promising (e.g. doesn't sound like a silent), he still expressed cautious optimism regarding Lyons due to 1) UM's academics and 2) Blake Countess's efforts to recruit Lyons to UM.