See shmirashalashon.blogspot.com
The website translates the Chofetz Chaim’s Sefer Shmiras Halashon into English.
According to the Shmiras Halashon Yomi calendar, this is the post for today: http://shmirashalashon.blogspot.com/2007/12/shmiras-halashon-shevat-15-one-hundred.html
Happy Tu B’shvat!
( P.S. Tommorow’s lesson is at http://shmirashalashon.blogspot.com/2007/12/shmiras-halashon-shevat-16-one-hundred.html )