Hi!
I have started up my own su-doku site, it is principally aimed at us junior players. It can be found at...
http://s13.invisionfree.com/Sudoku
Please join, its costs nothing and takes less than 1 minute.
You can talk all you like, do puzzles and it has some great su-doku links.
Please note: Anyone can join, not just juniors (although that is who it is aimed at).
Thanks