I also recommend the Joe Henbethydd's program ChuDo, which have a nice and customizable interface.
You can download it here http://sadbhava.ru/chudo/index_en.html
It contains move tips (useful for beginners), training mode to learn pieces and their moves and promotions.
For use playing correspondence games you can choose game mode "vs Human" and make moves for you and your opponent and then save the game and load it later. Very convenient.
If you need a quick way to make a board diagram from scratch, this is a very good site for that.
http://toybox.a.la9.jp/chushogi/dhtmlchu/chush2.html
Only 5 buttons - nice and simple. The promoted sides are in semi-cursive and red.