I don't have any first-hand knowledge, wasn't even aware of him until you posted but here is a small scouting report I found:
Name: Phillip Humber
Height/Weight: 6-4 / 210
Bats/Throws: R / R
Date of Birth: 12/21/82
#8 college player according to Baseball America, #11 overall. #9 college player according to Baseball America. #7 propsect in the Cape Cod League and a 2nd-team preseason All-American according to BA. Doesn't have the size of Niemann or the stuff of Townsend, but Humber is probably the most polished of the 3 talented pitchers from Rice. He has been in the weekend rotation since his freshman year, and spins the best curveball of the 3. He works in the low-90s, and exhibits outstanding poise & maturity on the mound. Didn't have as good of a year last year as Niemann & Townsend, but he started the biggest game of the year against Stanford in the College World Series. He also has the most prototypical size of the 3 with an athletic 6'4" 210 pound frame. With a good spring Humber could easily vault into the top 5 for this June's draft, and if all goes well, we could see an unprecedented 3 players from the same school going within the top 10 picks.
Maine has a good swing for a pitcher but on anything that moves, he has no chance. And if it's a fastball, it has to be up in the zone. Basically, the pitcher has to hit his bat. - Mike Pelfrey