So I found a good link from Colorado Fan over in Zonis's diary, and we need a DLD, so here it is; our man Farhan gushes about all the prospects.
Turns out Sweeney is awesome:

It's easy to forget that just a year ago this guy was ranked as the White Sox' top prospect and as one of the top prospects in all of baseball.  His numbers went backwards this year, but he was fighting through wrist issues for a good part of the season.  The knock on him is his power, but he played last year at just 22 and still has time to mature as a hitter.  On top of that, he has actually shown good power vs. right-handed pitching -- .294/.361/.481 with 22 HR in 572 AB over the last 2 years in AAA.

Also surprisingly awesome: Greg Smith.

Greg Smith is a guy whose stuff and numbers don't jump out at you, but he knows how to pitch.  Statistically, he looks a lot like Micah Owings did after 2006, and from a scouting perspective there are similarities as well - both guys have average stuff but pitch above it with their moxie and willingness to go right after hitters.

More awesomeness: Arnold Leon.

The easy choice here is Arnold Leon, who we recently signed out of Mexico.  In the Mexican League this summer, he posted a sub-2 ERA as an 18-year old, an incredible feat at any age given the extreme hitter-friendly environment in that league.  He continued to pitch well in Winter Ball, where our scouts saw him up to 94 and had high praise for his command and feel for pitching.  He will probably start out the year in Stockton, but given his success in the Mexican League (which is generally viewed as being equivalent to a AA/AAA level), he could move quickly.

Read the whole thing! These interviews over at MVN with the #1 Z-man are always stellar.