"Why hana but kusabana?"  Some Random Articles about Japanese

When to add a tenten
http://en.wikipedia.org/wiki/Rendaku (English)

When to use a small "tsu"
http://en.wikipedia.org/wiki/Sokuon (English)

Basic rules for reading Japanese
http://tiaokumura.exblog.jp/2071067/ (Japanese)

Ne vs. Yo at the end of a sentence
http://nihongo-teacher.com/docu/tips.php (English)