Every year Baseball America publishes there list of top ten prospects. Here is their top ten for 2003 and an alternative version based on player's performance.
Baseball America's Top Ten for 2003
1. Joe Mauer
2. Justin Morneau
3. Michael Cuddyer
4. Michael Restovich
5. Denard Span
6. Scott Tyler
7. J.D. Durbin
8. Jason Kubel
9. Lew Ford
10. Adam Johnson
An alternative version based on actual performance:
6. Jesse Crain
7. Jason Bartlett
8. Garret Jones
9. Nick Blackburn
10. Grant Balfour
Misses: Tyler, Ford, Johnson, Durbin, Restovich
Missed: Crain, Bartlett, Jones, Blackburn, Balfour
Summarizing that, Baseball America had five guys who didn't belong on the list in retrospect. The only one of those players that provided any value at the major league level was Lew Ford. The five players they missed have all provided considerably more value and you could argue Bowen, Rodriguez, Neshek and Morales from the list below would make the list ahead of Ford as well.
Here are players that were considered:
Gulf Coast Twins
Here is the 2002 Top Ten Evaluation for comparison.