Personally, I love to see how a prospect became the player he is today. I didn't follow most of these guys while they were in the minors because I was simply too young to understand the whole minor league system. I requested this retro from John Sickels and he was kind enough to do a writeup.

Similarly to the John Ely post below, I'll link the article and post an excerpt:

http://www.minorleagueball.com/2010/5/29/1491864/prospect-retro-hong-chih-kuo

Kuo split '06 and '07 between Triple-A and the majors, then posted a 2.14 ERA with a 96/21 K/BB in 80 innings for the Dodgers in '08. He was limited to 30 innings by more elbow problems in '09, but remained effective when he was on the mound. The elbow has been bothersome again this spring, but he's been great when on the mound with a 1.69 ERA and a 13/3 K/BB in 11 innings with just five hits allowed.

In his major league career, Kuo has a 3.67 ERA with a 249/89 K/BB in 216 innings, 180 hits, 117 ERA+, 2.95 FIP.