Super F League and several of my blogs have discussed about how Futsal can really develop your soccer skills.  Several Brazilian Super Stars of Soccer such as Michel Bastos, Robinho and Jádson explain how playing the game as youngsters helped their careers thrive according to uefa.com article. 
This is a must see article and video from UEFA.com.
Link to UEFA.com Article Bastos, Robinho and Jádson on futsal

I have to add, Futsal is lot's of fun to watch!