Not sure if you have seen some of these....
A pretty good source for info on prospects and articles. They even talk MLB baseball at times.
Another Baseball blog by John Sickels, you might know him as he has worked with other places. Both this site and the one I mentioned above have useful links to other things besides prospects if you want to check those out.
It does mainly give stats, but if you scroll through the day, at the end it will have quotes and links to any articles/info on prospects that day. If anything it's easier to look there at times instead of going to every site yourself.
If you don't like just reading stats, then this guy goes through the day in the minors w/ a bit of description to go with it. Sometimes though he lags a bit, but he also has his league/organization rankings.
Anyways those are the ones that I come to my head quickly that are free.