Don't forget that Sweed had a wrist injury that required surgery before the 2007 UT season. He reinjured it mid-season, and had surgery again. That limited his development as a senior, so in some ways he was like a junior who came out early.
If you look at this year's crop of WRs, generally regarded as deep and good, there are only two who come close to Sweed in terms of height + 40 time + VJ.
Sweed - 6'3 7/8", 4.48 s., 35" (25th in 2008 NFLDS).
Brian Robiskie, Ohio State - 6'2 7/8", 4.46 s., 37.5" (37th overall)
Kenny Britt, Rutgers - 6'2 7/8", 4.50 s., 37" (39th overall)
Close enough in terms of measurables; slotted lower than Sweed was but likely to go higher than he actually did. NFLDS compares Britt to, ta-da, Sweed.
Louis Murphy, Florida, is 6'2 3/8", ran a 4.32 but did not jump, rated 70th overall.
Ramses Barden, Cal-Poly, 6'6", 4.55, 33.5", rated 111.
Patrick Turner, 6'5 1/8", no workout numbers, rated 143.
Aaron Kelly, Clemson, 6'4 1/2", 4.49, 38", 180.
That's about it from the rounds that count. The four at the bottom are kinda sorta in the same measurables mix, but comparisons lack (e.g., Kelly is compared to Fred Gibson). Robiskie and Britt, whom I like, look closest to Sweed's measurables.
Sort of think they just plug Sweed right into 85's plays and go for a smallish slot/KR/PR vein.
Still think Sweed will have an up and down year, but we're used to that with Washington. He'll be like that, but show flashes of being better than Nate. 40 catches seems a bit heady, but 30 seems reasonable. If he starts clicking as the season goes on, 35-40 might be feasible.