Gil has posted his top 100 on NFL.com.  Here is his explantion of how he ranks the players.

Here is my attempt at identifying the first 100 players I think will be drafted this weekend. I look at the prospects' most important individual characteristics, position specifics, along with height and speed to formulate this order. Medical status (for players such as Phillip Merling and Jonathan Stewart) was not considered in the rankings. And playing experience (i.e., long-time starter vs. one-year wonder) is something I value.

Rather than ranking the players from one to 100, I have broken them into 10 tiers of 10 and listed them alphabetically within the tiers. Nobody can predict exactly where every player is going to get drafted. The point here is to pinpoint the range in which a prospect is likely to go.

http://www.nfl.com/draft/story?id=09000d5d807e3288&template=with-video&confirm=true