Currently Mel Kiper Jr. has Denard Robinson listed as the #5 senior WR.
When you add in the junior WRs he likely falls somewhere between #8 - #10 in the upcoming draft.
For a point of reference, the #8 WR in this year's draft was Ryan Broyles (Detroit Lions #54) --- #9 was Rueben Randle with the last pick of the 2nd round.
#10 was DeVeir Posey, 3rd round #68 overall to the Texans.
Those putting Denard from late 2nd to early 4th seem to be accurate according to most analysis.