Thought others might like this link:
2012 NFL Draft Signings
It has all the draft picks and their signing status. I think I posted a different article a while back that talked about the top of the third round having a sticking point in negotiations. This link seems to solidify that idea.
Round 1 unsigned - 14 (8 of top 10)
Round 2 unsigned - 3
Round 3 unsigned - 12 (also 8 of top 10)
Round 4 unsigned - 2 (1 is dallas, and 1 is NO, who obviously has a lot of issues going on)