Many excellent websites tell the story of Louis's life. Google "Louis Braille" and you'll easily find them.
Examples:
http://en.wikipedia.org/wiki/Louis_Braille
http://louisbrailleschool.org/resources/louis-braille/
www.duxburysystems.com/braille.asp
For a hardcover illustrated biography of Braille's life with over 100 archival images from France, see Louis Braille: A Touch of Genius, our landmark biography and winner Best of Category New England Book Show 2007.
Also check out the Louis Braille Bicentennial Traveling Exhibit.