We all know the prospect "experts" go on and on about the top guys, but we also know that often times the lesser known prospects will go on to be really good. To start it off:

Edwin Escobar - LHP - 21 y/o - Started the season in the California league (high-A and known to be an extreme hitter's league) and was recently promoted to the AA Eastern League.
Cal League
74.2 IP
68 Hits
3 HR
17 BB
92 Ks
2.89 ERA

Eastern League - 4 starts so far
24 IP
20 Hits
0 HR
5 BB
26 Ks
3.00 ERA

As you can see he's pretty advanced for a 21 yr old. His component stats are excellent - a great K/BB ratio and only 3 HR in 98.2 IP. The scouting reports say he works around 91-94 and can touch 95 (i've also heard 96). Supposedly he throws a sweeping curve and a developing changeup. The giants don't usually rush their young players, but it wouldn't surprise me if he cracked the rotation at some point next year