For all you new kanji lovers out there, you'll be happy to know that lots of kanji have multiple forms! Of course, in modern times usually only one of these is used, but there are exceptions (such as in writing kanji in people's names). Not only that, you might be surprised to learn that the most common Japanese encoding (Shift_JIS) includes many of these barely-seen characters (making us wonder why they put them in anyway). Let's not let them go to waste, and let's use them! Here are a few below:

Kanji in red brackets are the jouyou "Common Use" versions; Kanji in black brackets are the kyuujitai "Old-Style" versions (if the jouyou versions are not already the old-style versions); All other kanji are itaiji "Other" versions. (Not all kyuujitai exist in this encoding, often because they have too many strokes.) All mean the same thing. Genji "Original" versions are unmarked, if listed. Various pronunciations of the Kanji are given in the leftmost column, including Kan, Go, Kun, and Chinese pinyin readings.

ケン (ケム) (漢) コン (コム) (呉) つるぎ jian4	【剣】	【劍】劒 劔 剱 釼
ム (呉) ブ (漢) ない wu2	【無】	无  毋 亡
トウ (漢) ツ (呉) たたかう qiu1	【闘】	【鬪】鬥
シュウ (シウ) (漢) シュ (呉) あき qiu1	【秋】	穐  龝
【一】カイ【二】カイ(漢) 【一】ケ【二】ゲ(呉) 【一】とく・とかす・とける 【一】jie3 jie4【二】xie4	【解】	觧

Notes: For the kanji "mu", only the first two are actually identical in meaning. The latter two can have different usages, but are both sometimes used in substitution for the first two (in classical texts such as the Doutokukyou (Daodejing) and Ekikyou (Yijing)). For the kanji "tou", the third kanji is actually the genji original form. For the kanji "shuu", the kyuutaiji is unavailable in Shift_JIS coding.

It is interesting that the Shift_JIS encoding includes so many versions of the kanji for 'sword.' Further proof of Japanese sword obsession?