== A few things... == 

 Now, I know very little about Japanese, so if I'm wrong just say so. 

 That aside... 

 1 - I've heard the romaji of katakana called Katakana English many times, but no reference to this term is made. 

 2 - In the "Alphabet letter names in Japanese" section, I believe the letter Z is zetto not zeddo. 

 3 - Long vowels don't necessarily need the line over top. I've seen many romaji words with long vowels without the symbol, and some long vowels are translated at a double vowel (which can be awkward when there is a long 'o' sound). Some mention of these other styles of translation should be made. For example, student can be written as kyoshuusei, kyoushuusei, kyōshuusei,  and I've seen (rarely) kyooshuusei. 

 4 - Romaji is often mistakenly writen/pronounced 'romanji'. There should be a note of this in the article to alleviate confusion.