The official sites have stats and some make pretty detailed game notes and game logs. You can connect to them all via
MiLB.com I believe. The official sites:
DSL Sox 1
DSL Sox 2
Bristol
Great Falls
Kannapolis
Winston-Salem
Birmingham
Charlotte
Otherwise for stats I use:
The Hardball Times
The Baseball Cube
Other articles and info:
Baseball America (they do have free articles)
Project Prospect (might find something there)
SoxTalk has a minor league board and runs the
FutureSox site. FutureSox does their own interviews with players as well.
And of course theres the old
google search.