I think Holliday's performance this year knocks out any question of him being a flash in the pan. He's gotten progressively better in his major league seasons, and for me, the best indication that he's becoming a first round talent is the fact that he's starting to produce on the road as well as at Coors:
Splits (doesn't include today's numbers)
Road: 134 ab's 5 homeruns, 21 runs, 25 rbis, .323 average, and .894 ops
Home: 144 ab's, 6 homeruns, 22 runs, 27 rbi, .396 avg, and 1.094.
I'm in a roto league, so I don't really care about his splits, especially since he's not a free agent until 2010. But either way, I'm encouraged that his numbers BEFORE Coors inflation are pretty darn good. Throw in a few steals per year, and I think he should be drafted where Manny was being drafted in his prime, late first round, early second round.
His last step is to learn how to take a pitch or two.