Every year I keep an updated spreadsheet on NFL free agents. You can view this file embedded on my blog here:
This document includes every player with an expiring contract in the offseason. (I also add released players in the offseason as they happen.) You can sort by 2012 team, name, primary and secondary positions, free agent type, and 2013 team when guys have signed.
If we could sticky this that'd be great as I think it could be a nice tool for everyone to use. It allows you to easily see which guys are free agents at the positions you think the Dolphins should look at. In general, I find it very useful.
Please let me know of any questions, comments or suggestions you have.